Interesting! I have been using the Jellyfin addon for Kodi as my main client, but it would be interesting to try Android TV again on the same device, since I 90% only use it for things on Jellyfin. How is the music player on it?
I only used it for a short while - from memory there was no seek, but it could have just been because my chrome tv remote didn't have seek buttons, long press next/previous didn't work.