default or selected kernelversion does not have config value CONFIG_UBIFS_FS_ENCRYPTION.
Result is shown for kernelversion 6.9.9
UBIFS Encryption
configname: CONFIG_UBIFS_FS_ENCRYPTION
Linux Kernel Configuration
└─>File systems
└─>Miscellaneous filesystems
└─>UBIFS Encryption
In linux kernel since version 4.1 (release Date: 2015-06-21)
Enable encryption of UBIFS files and directories. This
feature is similar to ecryptfs, but it is more memory
efficient since it avoids caching the encrypted and
decrypted pages in the page cache.
feature is similar to ecryptfs, but it is more memory
efficient since it avoids caching the encrypted and
decrypted pages in the page cache.