SC on Android TV or Google TV
Suggested client: Official Jellyfin app
Unlike on Android's mobile or tablet, which I'd recommend Findroid as a client - for Android TV or Google TV, I'd suggest using the official Jellyfin for TV app "Jellyfin for Android TV" from Google Playstore (for now).
Enter the address of the server, add your account.
Bear in mind that you may have to change the player client within the app itself to either LibVLC (uses VLC's libraries) or just another external player of your choosing. Also, the official Jellyfin app for Android TV & mobile/tablet are different, make sure you get the right one.
..and that's it, really!