Wheret's the RocksDB options file location?

I am trying to optimise the RocksDB performance but I don't know where the option files are.

I am looking for the Options file that contains:

This is a RocksDB option file.

For detailed file format spec, please refer to the example filein examples/rocksdb_option_file_example.ini

DBOptionscompaction_readahead_size=0strict_bytes_per_sync=falsebytes_per_sync=1048576max_background_jobs=10avoid_flush_during_shutdown=falsemax_background_flushes=-1delayed_write_rate=16777216max_open_files=512max_subcompactions=1

etc...

I found a couple of files within the /tmp/blockchain/chains/name/db/full called OPTIONS-OOOXXbut these files contains default settings only preset for the startup.