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

kexec jump

configname: CONFIG_KEXEC_JUMP

Linux Kernel Configuration
└─>Processor type and features
└─>kexec jump
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Jump between original kernel and kexeced kernel and invoke
code in physical address mode via KEXEC

depends
CONFIG_HIBERNATION
CONFIG_KEXEC