You will have to write your own code to parse the instrumentlist. The api is just that - basic building blocks. You need to write your own code to use these building blocks to achieve whatever end goal you have.
In your case the symbolname for Reliance industries is RELIANCE instrument_token,exchange_token,tradingsymbol,name,last_price,expiry,strike,tick_size,lot_size,instrument_type,segment,exchange 738561,2885,RELIANCE,"RELIANCE INDUSTRIES",0,,0,0.05,1,EQ,NSE,NSE
So you would search for all symbols where name is "RELIANCE" and segment is "NFO-OPT". This will return a list of all options for Reliance Industries. Something that looks like 39497986,154289,RELIANCE23NOV1840CE,"RELIANCE",0,2023-11-30,1840,0.05,250,CE,NFO-OPT,NFO 39498242,154290,RELIANCE23NOV1840PE,"RELIANCE",0,2023-11-30,1840,0.05,250,PE,NFO-OPT,NFO 39498498,154291,RELIANCE23NOV1860CE,"RELIANCE",0,2023-11-30,1860,0.05,250,CE,NFO-OPT,NFO 39498754,154292,RELIANCE23NOV1860PE,"RELIANCE",0,2023-11-30,1860,0.05,250,PE,NFO-OPT,NFO 39499010,154293,RELIANCE23NOV1880CE,"RELIANCE",0,2023-11-30,1880,0.05,250,CE,NFO-OPT,NFO 39499266,154294,RELIANCE23NOV1880PE,"RELIANCE",0,2023-11-30,1880,0.05,250,PE,NFO-OPT,NFO 39499522,154295,RELIANCE23NOV1900CE,"RELIANCE",0,2023-11-30,1900,0.05,250,CE,NFO-OPT,NFO 39499778,154296,RELIANCE23NOV1900PE,"RELIANCE",0,2023-11-30,1900,0.05,250,PE,NFO-OPT,NFO 39500034,154297,RELIANCE23NOV1920CE,"RELIANCE",0,2023-11-30,1920,0.05,250,CE,NFO-OPT,NFO 39500290,154298,RELIANCE23NOV1920PE,"RELIANCE",0,2023-11-30,1920,0.05,250,PE,NFO-OPT,NFO 39505666,154319,RELIANCE23NOV1940CE,"RELIANCE",0,2023-11-30,1940,0.05,250,CE,NFO-OPT,NFO 39505922,154320,RELIANCE23NOV1940PE,"RELIANCE",0,2023-11-30,1940,0.05,250,PE,NFO-OPT,NFO 39506178,154321,RELIANCE23NOV1960CE,"RELIANCE",0,2023-11-30,1960,0.05,250,CE,NFO-OPT,NFO 39506434,154322,RELIANCE23NOV1960PE,"RELIANCE",0,2023-11-30,1960,0.05,250,PE,NFO-OPT,NFO 39506690,154323,RELIANCE23NOV1980CE,"RELIANCE",0,2023-11-30,1980,0.05,250,CE,NFO-OPT,NFO 39506946,154324,RELIANCE23NOV1980PE,"RELIANCE",0,2023-11-30,1980,0.05,250,PE,NFO-OPT,NFO 39507202,154325,RELIANCE23NOV2000CE,"RELIANCE",0,2023-11-30,2000,0.05,250,CE,NFO-OPT,NFO 39507458,154326,RELIANCE23NOV2000PE,"RELIANCE",0,2023-11-30,2000,0.05,250,PE,NFO-OPT,NFO 39507714,154327,RELIANCE23NOV2020CE,"RELIANCE",0,2023-11-30,2020,0.05,250,CE,NFO-OPT,NFO 39507970,154328,RELIANCE23NOV2020PE,"RELIANCE",0,2023-11-30,2020,0.05,250,PE,NFO-OPT,NFO 39508226,154329,RELIANCE23NOV2040CE,"RELIANCE",0,2023-11-30,2040,0.05,250,CE,NFO-OPT,NFO 39508482,154330,RELIANCE23NOV2040PE,"RELIANCE",0,2023-11-30,2040,0.05,250,PE,NFO-OPT,NFO 39508738,154331,RELIANCE23NOV2060CE,"RELIANCE",0,2023-11-30,2060,0.05,250,CE,NFO-OPT,NFO 39508994,154332,RELIANCE23NOV2060PE,"RELIANCE",0,2023-11-30,2060,0.05,250,PE,NFO-OPT,NFO 39509250,154333,RELIANCE23NOV2080CE,"RELIANCE",0,2023-11-30,2080,0.05,250,CE,NFO-OPT,NFO ... ... ... 42190594,164807,RELIANCE24JAN2580CE,"RELIANCE",0,2024-01-25,2580,0.05,250,CE,NFO-OPT,NFO 42190850,164808,RELIANCE24JAN2580PE,"RELIANCE",0,2024-01-25,2580,0.05,250,PE,NFO-OPT,NFO 42191106,164809,RELIANCE24JAN2600CE,"RELIANCE",0,2024-01-25,2600,0.05,250,CE,NFO-OPT,NFO 42191362,164810,RELIANCE24JAN2600PE,"RELIANCE",0,2024-01-25,2600,0.05,250,PE,NFO-OPT,NFO 42191618,164811,RELIANCE24JAN2620CE,"RELIANCE",0,2024-01-25,2620,0.05,250,CE,NFO-OPT,NFO 42191874,164812,RELIANCE24JAN2620PE,"RELIANCE",0,2024-01-25,2620,0.05,250,PE,NFO-OPT,NFO 42192130,164813,RELIANCE24JAN2640CE,"RELIANCE",0,2024-01-25,2640,0.05,250,CE,NFO-OPT,NFO 42192386,164814,RELIANCE24JAN2640PE,"RELIANCE",0,2024-01-25,2640,0.05,250,PE,NFO-OPT,NFO 42192642,164815,RELIANCE24JAN2660CE,"RELIANCE",0,2024-01-25,2660,0.05,250,CE,NFO-OPT,NFO 42192898,164816,RELIANCE24JAN2660PE,"RELIANCE",0,2024-01-25,2660,0.05,250,PE,NFO-OPT,NFO 42193154,164817,RELIANCE24JAN2680CE,"RELIANCE",0,2024-01-25,2680,0.05,250,CE,NFO-OPT,NFO 42193410,164818,RELIANCE24JAN2680PE,"RELIANCE",0,2024-01-25,2680,0.05,250,PE,NFO-OPT,NFO 42193666,164819,RELIANCE24JAN2700CE,"RELIANCE",0,2024-01-25,2700,0.05,250,CE,NFO-OPT,NFO 42193922,164820,RELIANCE24JAN2700PE,"RELIANCE",0,2024-01-25,2700,0.05,250,PE,NFO-OPT,NFO 42194178,164821,RELIANCE24JAN2720CE,"RELIANCE",0,2024-01-25,2720,0.05,250,CE,NFO-OPT,NFO 42194434,164822,RELIANCE24JAN2720PE,"RELIANCE",0,2024-01-25,2720,0.05,250,PE,NFO-OPT,NFO
If you want to further narrow down the list, by current/near/far options, your code will need to include the logic too.
The api is just that - basic building blocks. You need to write your own code to use these building blocks to achieve whatever end goal you have.
In your case the symbolname for Reliance industries is RELIANCE
instrument_token,exchange_token,tradingsymbol,name,last_price,expiry,strike,tick_size,lot_size,instrument_type,segment,exchange
738561,2885,RELIANCE,"RELIANCE INDUSTRIES",0,,0,0.05,1,EQ,NSE,NSE
So you would search for all symbols where name is "RELIANCE" and segment is "NFO-OPT".
This will return a list of all options for Reliance Industries. Something that looks like
39497986,154289,RELIANCE23NOV1840CE,"RELIANCE",0,2023-11-30,1840,0.05,250,CE,NFO-OPT,NFO
39498242,154290,RELIANCE23NOV1840PE,"RELIANCE",0,2023-11-30,1840,0.05,250,PE,NFO-OPT,NFO
39498498,154291,RELIANCE23NOV1860CE,"RELIANCE",0,2023-11-30,1860,0.05,250,CE,NFO-OPT,NFO
39498754,154292,RELIANCE23NOV1860PE,"RELIANCE",0,2023-11-30,1860,0.05,250,PE,NFO-OPT,NFO
39499010,154293,RELIANCE23NOV1880CE,"RELIANCE",0,2023-11-30,1880,0.05,250,CE,NFO-OPT,NFO
39499266,154294,RELIANCE23NOV1880PE,"RELIANCE",0,2023-11-30,1880,0.05,250,PE,NFO-OPT,NFO
39499522,154295,RELIANCE23NOV1900CE,"RELIANCE",0,2023-11-30,1900,0.05,250,CE,NFO-OPT,NFO
39499778,154296,RELIANCE23NOV1900PE,"RELIANCE",0,2023-11-30,1900,0.05,250,PE,NFO-OPT,NFO
39500034,154297,RELIANCE23NOV1920CE,"RELIANCE",0,2023-11-30,1920,0.05,250,CE,NFO-OPT,NFO
39500290,154298,RELIANCE23NOV1920PE,"RELIANCE",0,2023-11-30,1920,0.05,250,PE,NFO-OPT,NFO
39505666,154319,RELIANCE23NOV1940CE,"RELIANCE",0,2023-11-30,1940,0.05,250,CE,NFO-OPT,NFO
39505922,154320,RELIANCE23NOV1940PE,"RELIANCE",0,2023-11-30,1940,0.05,250,PE,NFO-OPT,NFO
39506178,154321,RELIANCE23NOV1960CE,"RELIANCE",0,2023-11-30,1960,0.05,250,CE,NFO-OPT,NFO
39506434,154322,RELIANCE23NOV1960PE,"RELIANCE",0,2023-11-30,1960,0.05,250,PE,NFO-OPT,NFO
39506690,154323,RELIANCE23NOV1980CE,"RELIANCE",0,2023-11-30,1980,0.05,250,CE,NFO-OPT,NFO
39506946,154324,RELIANCE23NOV1980PE,"RELIANCE",0,2023-11-30,1980,0.05,250,PE,NFO-OPT,NFO
39507202,154325,RELIANCE23NOV2000CE,"RELIANCE",0,2023-11-30,2000,0.05,250,CE,NFO-OPT,NFO
39507458,154326,RELIANCE23NOV2000PE,"RELIANCE",0,2023-11-30,2000,0.05,250,PE,NFO-OPT,NFO
39507714,154327,RELIANCE23NOV2020CE,"RELIANCE",0,2023-11-30,2020,0.05,250,CE,NFO-OPT,NFO
39507970,154328,RELIANCE23NOV2020PE,"RELIANCE",0,2023-11-30,2020,0.05,250,PE,NFO-OPT,NFO
39508226,154329,RELIANCE23NOV2040CE,"RELIANCE",0,2023-11-30,2040,0.05,250,CE,NFO-OPT,NFO
39508482,154330,RELIANCE23NOV2040PE,"RELIANCE",0,2023-11-30,2040,0.05,250,PE,NFO-OPT,NFO
39508738,154331,RELIANCE23NOV2060CE,"RELIANCE",0,2023-11-30,2060,0.05,250,CE,NFO-OPT,NFO
39508994,154332,RELIANCE23NOV2060PE,"RELIANCE",0,2023-11-30,2060,0.05,250,PE,NFO-OPT,NFO
39509250,154333,RELIANCE23NOV2080CE,"RELIANCE",0,2023-11-30,2080,0.05,250,CE,NFO-OPT,NFO
...
...
...
42190594,164807,RELIANCE24JAN2580CE,"RELIANCE",0,2024-01-25,2580,0.05,250,CE,NFO-OPT,NFO
42190850,164808,RELIANCE24JAN2580PE,"RELIANCE",0,2024-01-25,2580,0.05,250,PE,NFO-OPT,NFO
42191106,164809,RELIANCE24JAN2600CE,"RELIANCE",0,2024-01-25,2600,0.05,250,CE,NFO-OPT,NFO
42191362,164810,RELIANCE24JAN2600PE,"RELIANCE",0,2024-01-25,2600,0.05,250,PE,NFO-OPT,NFO
42191618,164811,RELIANCE24JAN2620CE,"RELIANCE",0,2024-01-25,2620,0.05,250,CE,NFO-OPT,NFO
42191874,164812,RELIANCE24JAN2620PE,"RELIANCE",0,2024-01-25,2620,0.05,250,PE,NFO-OPT,NFO
42192130,164813,RELIANCE24JAN2640CE,"RELIANCE",0,2024-01-25,2640,0.05,250,CE,NFO-OPT,NFO
42192386,164814,RELIANCE24JAN2640PE,"RELIANCE",0,2024-01-25,2640,0.05,250,PE,NFO-OPT,NFO
42192642,164815,RELIANCE24JAN2660CE,"RELIANCE",0,2024-01-25,2660,0.05,250,CE,NFO-OPT,NFO
42192898,164816,RELIANCE24JAN2660PE,"RELIANCE",0,2024-01-25,2660,0.05,250,PE,NFO-OPT,NFO
42193154,164817,RELIANCE24JAN2680CE,"RELIANCE",0,2024-01-25,2680,0.05,250,CE,NFO-OPT,NFO
42193410,164818,RELIANCE24JAN2680PE,"RELIANCE",0,2024-01-25,2680,0.05,250,PE,NFO-OPT,NFO
42193666,164819,RELIANCE24JAN2700CE,"RELIANCE",0,2024-01-25,2700,0.05,250,CE,NFO-OPT,NFO
42193922,164820,RELIANCE24JAN2700PE,"RELIANCE",0,2024-01-25,2700,0.05,250,PE,NFO-OPT,NFO
42194178,164821,RELIANCE24JAN2720CE,"RELIANCE",0,2024-01-25,2720,0.05,250,CE,NFO-OPT,NFO
42194434,164822,RELIANCE24JAN2720PE,"RELIANCE",0,2024-01-25,2720,0.05,250,PE,NFO-OPT,NFO
If you want to further narrow down the list, by current/near/far options, your code will need to include the logic too.
If you want results, you need to put in the work.