I've never noticed the possibility of loading a ZDepth map in the native PS Lens Blur filter, thanks for that @Juraj.
Anyway I prefer using the new Lens Blur feature in Camera Raw, have you tried it? It's pretty awesome. Unfortunately you can't load a ZDepth map with it, but so far I found it sufficient for my needs, at least for exteriors with just a tiny bit of DOF. It may not work as well with interiors with strong DOF though, where you may prefer using the Corona Camera DOF.