I don't think such exists at the moment. But you can get close through a couple of steps.
When I worked on my Motion Pictures TM, I somewhat managed to imitate MB's
double-click-open-full-sized-image behaviour.
What I'd done was create an autohide panel that could be activated on an onclick action.
The panel contained the album cover and
displayed it at maximum size (its width & height = height of the screen)
One hiccup to it though, is that:
The dimensions are fixed...fixed in the sense that they do not dynamically adjust to the image's specific size.
So that means rectangular artwork will also get displayed at a 1x1 ratio.
I only have square artwork myself - so I wasn't bothered by this when I did the TM.
You'll let me know if you wanna try that out and need specifics.
Edit:
Oops! I'm just noticing the "embedded theater mode" in your post.
Sorry, disregard the above. It would only work for a full sized TM.
I already spend hours on end on social media. Might as well spare a few of those to a greater purpose here.