My LG WebOS TV has it, and it’s pretty old (8 years?). It works fine most of the time, but the TV has a habit of disconnecting from the WiFi, and if I launch Jellyfin when the WiFi is borked, Jellyfin forgets my server config, and I have to enter it again. It also doesn’t work with my HTTPS URL, so I have to connect it to the HTTP one.
I set up Jellyfin this year, so maybe the app just didn’t exist yet. I’d imagine newer WebOS TVs wouldn’t have at least the HTTPS issue, and may behave better WRT WiFi.
Eh, worked fine for us for a few years on our LG WebOS TV, but now we use Jellyfin because it’s a much better experience.