

Without testing I’d try “F1”…“F12”. Edit: On second thought you likely mean media keys and such. There’s a tool called wev which shows a keys event name when pressed. E.g. the audio stop media key is “XF86AudioStop”. (When they are already bound they might not show up, because the compositor does not send them to wev).
https://fwupd.org/lvfs/devices/
In the devices list of lvfs/fwupd there’s a bunch of controllers supported. But it seems like it’s mostly their retro controllers. XBox-style controllers like their Ultimate C etc. are not supported.