I'm assuming you mean the jellyfin server and not the Android TV client specifically.

Running the jellyfin server on an SBC is possible, I'm running it on a pi 4 right now. Personally, I'd recommend installing docker and running the service in a container. There's official docs for how to do so https://jellyfin.org/docs/general/installation/container/

That being said, Jellyfin docs recommend against running on an SBC. I too, running it on an SBC, recommend against it. It can do the "happy path" well. But if the stored media is in a format that requires the server to transcode it for the current, it cannot handle it. The time it takes to transcode is several times longer than the actual run time of the media. You will have a bad time. I'm currently looking to change/upgrade the hardware to work around this