bluetooth remote controls, I run a NOCTUS. apple IR ones (the little white ones from the iPod days) with IR receiver out of a defunct Macbook (those are USB). game controllers, any kind.

Jellyfin player's UI in TV mode reacts only to up/down/left/right and enter and escape. you can use InputRemapper if your weapon of choice isn't recognized. also, jellyfin android apps connect to the player directly and you can control it from there.