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.