default or selected kernelversion does not have config value CONFIG_FSCACHE_OBJECT_LIST.
Result is shown for kernelversion 6.9.9

Maintain global object list for debugging purposes

configname: CONFIG_FSCACHE_OBJECT_LIST

Linux Kernel Configuration
└─>File systems
└─>Caches
└─>Maintain global object list for debugging purposes
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Maintain a global list of active fscache objects that can be
retrieved through /proc/fs/fscache/objects for debugging purposes