How do you watch Jellyfin on your TV?

[Host-in-the-Shell]

I use an LG TV with the Jellyfin app for LG, mostly because it's just a wrapper for the web client and that allows me to use a plugin such as intro skipper. That said, for your case you will need something like a roku or firestick. Obviously you can also go for the NVIDIA Shield Pro or similar, which is going to have way better format support as a client, but it costs significantly more; depending on your library and budget, you should select a client that adjusts best to your particular situation.