How do I make tilemaps change layers?

I'm using a family sortable system that uses y ascending imagepointY (YCompare) with objects and the player. This moves the objects to different layers "Infront" or "Behind" to make it look like the player, trees, and grass go in front or behind each other - giving that distance look. I made two tilemaps. One that places dirt and grass tiles and the other one for cliffs. I'm looking for a way to have the cliffs work similar to the sort system where the trees, grass, rocks further up the imagepointY go behind the cliffs and the ones below that appear on top of the tiled cliffs. Any ideas on how to do this?

Tilemap is one object, you can't assign different z-order values to individual tiles.