Is it possible to create and texture limestone mountains in WM?

I’ve been trying to recreate the Calanques of Marseille in WM but so far I haven’t been able to get anything accurate. This is what what I’m aiming for:

Is there a macro or another method to create and texture mountains like these? I have a number of photoscanned limestone cliff assets which can be used to detail the edges of the terrain, so all I really need is the shape of the mountains.

Any help with this would be appreciated!