ut is it a OMV plugin or you're running via docker?
I have no use for wetty but I installed it just for this thread.
aaron@rpi18:~ $ dpkg -l | grep openme
ii openmediavault 6.0.46-5 all openmediavault - The open network attached storage solution
ii openmediavault-cputemp 6.1.1 all cpu temperature plugin for openmediavault
ii openmediavault-flashmemory 6.2 all folder2ram plugin for openmediavault
ii openmediavault-keyring 1.0 all GnuPG archive keys of the OpenMediaVault archive
ii openmediavault-omvextrasorg 6.1.1 all OMV-Extras.org Package Repositories for OpenMediaVault
ii openmediavault-photoprism 6.0.7-1 all openmediavault PhotoPrism plugin
ii openmediavault-s3 6.0.4-1 all openmediavault S3 plugin
ii openmediavault-sharerootfs 6.0.2-1 all openmediavault share root filesystem plugin
ii openmediavault-symlinks 6.0.4 all OpenMediaVault symlinks plugin
ii openmediavault-wetty 6.0.4-1 all openmediavault WeTTY (Web + TTY) plugin