I found this after some googling and I’d love to see it ported to Hass.
It seems more developed then Plex Activity Monitor and has a faster response time.
The plex platform allows you to connect a Plex Media Server to Home Assistant. It will allow you to control media playback and see the current playing item. The preferred way to setup the Plex platform is by enabling the the the discovery component and requires GDM to be enabled.
Unfortunately, the current plex platform component only works for clients that aren’t signed in to myPlex. (unless something has changed recently)
With my client devices signed in to myPLex they can access not only my local servers, but also my remote servers and friends servers. It’s a great system. Yes, I realize I won’t be able to automate with friends servers but it would suck to have to log in and log out all the time just to switch between everything.