That’s pretty cool, didn’t know about that before. If it’s just a bunch of Python scripts, Batocera should already have all of the infrastructure to support it.
However, it is a matter of 1. drivers it might depend on, which shouldn’t be too hard to port and 2. the paths being hard-coded for RetroPie paths.
The highest chance of its inclusion in Batocera is to ask the developer of pimarquee to consider porting their tool to Batocera.