There needs to be some way in Lightroom Classic to identify photos containing Depth Map information. I notice that (Non-classic) Lightroom CC has a search "facet" for Depth Map - why not Lightroom Classic? So unless I've missed them somewhere - please consider adding:
PS - I realize I could narrow things down a bit by searching for File Type = HEIC, but that still gives a superset of the desired results. Further, in the future I expect that other file formats besides HEIC could also contain depth maps.