My setup is quite similar, I currently have my tv disconnected from the network and stream via another device. What I would like to achieve is to use the tv capabilities to play my local streams, as I don’t use cloud streaming services, but I would need to connect it to the network.
I may look into setting a non-internet routed vlan and access point, so I can connect the tv to the network but not to internet, althought it may later become cumbersome as I would need to update the Jellyfin or Kodi apps
Thanks, I will take a look at those