List can be found heere
/usr/share/X11/xkb/rules/xorg.lst
Set by command
setxkbmap -option 'caps:hyper'
Now run ibus-setup, navigate to add type `Hyper_L` prevent switch case and toggle layout.
FYI: key name you can found with `xev` application
For persistent changes
/etc/X11/xorg.conf.d/00-keyboard.conf
1 Section "InputClass"
2 Identifier "system-keyboard"
3 MatchIsKeyboard "on"
4 Option "XkbOptions" "caps:hyper"
5 EndSection