No problem using docker to run Plex. It would take quite some time to build a docker-compose file to suit all your needs, but I am sure anyone can do it.
I was wondering how can I have a tab/link on the OMV left panel to PMS page?
Or anyway to make a custom link on the OMV left panel?
You know we used to have a Plex menu page on the OMV panel if you use plex plug-in.