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As others have said, that’s basically pop shell. Cosmic will be out of alpha at some point this year, but you don’t need to wait for that to get started. I’ve been using pop os on my personal machine, and Ubuntu gnome with the pop-shell gnome extension for many years and it works great. Pretty much zero config and it is super easy to set up and get started.
I believe from last time I checked that it was more an issue of LG not approving the app to be listed rather than it not being available. It being a wrapper makes sense too on the older webOS apps as it’s basically a PWA with some JS libs to interact with the TV.
I got a chrome cast because nordvpn didn’t have an LG app and the jellyfin client works great on that. Still annoying it’s not baked in though.