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.
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.