[bambax]

You can do that with Jellyfin and Tailscale trivially on devices you own; for a hotel TV you can use a GL.iNet travel router (which will also let you access your LAN from any device connected to it) and it's all free (except for the router of course, that you just buy once).

[oarsinsync]

How are you going about installing Jellyfin on random hotel TVs? None of the hotels I've stayed at have that level of freedom on their TVs.

(So I instead travel with an Apple TV that does all of the above, and more)

[bambax]

If there is a browser then that's all that's needed. Just point it to the LAN IP of your Jellyfin install.