default or selected kernelversion does not have config value CONFIG_CFQ_GROUP_IOSCHED.
Result is shown for kernelversion 6.9.9
CFQ Group Scheduling support
configname: CONFIG_CFQ_GROUP_IOSCHED
Linux Kernel Configuration
└─>Enable the block layer
└─>IO Schedulers
└─>CFQ Group Scheduling support
In linux kernel since version 2.6.33 (release Date: 2010-02-24)
Enable group IO scheduling in CFQ.