Good day! I am trying to find a good alternative as not to use the"smart" functions or using an Xbox to consume our media. I found a few options ie like plasma big screen but it’s no longer in development. Essentially I would line love to have it running on an rpi4 and just hooked up to the TV.
There’s probably a Plex add-on for Kodi. At least, there is for Jellyfin and Emby. If you don’t like the UI, try changing it. I prefer the one called “Arctic: Zephyr - Reloaded”. You’ll need to customize the homescreen a bit to get the most out of it. That way you can make it show widgets of your content, e.g. the latest content added, continue watching, specific libraries, etc. That, at least, works very well with Jellyfin through the Jellycon add-on.