Smoothing Terrain around Jigsaw Strucutres

I made a simple datapack that generates a jigsaw structure around the world.
My problem is that the structures dont blend in well with the surrounding environment. I have created a custom biome with custom desert dune terrain.
Sometimes the structures are sunken into a hill sometimes they float on top. Rarely they spawn in the relativeley flat valleys where they look natural. 
In my /worldgen/structure/ config file i currently use these options to control how the structures are placed:
"step": "surface_structures", "terrain_adaptation": "beard_box", "start_height": {   "absolute": 0 }, "project_start_to_heightmap": "WORLD_SURFACE_WG",
Are there some advanced options like e.g. shaping the surrounding terrain via a processor. Or do you have another idea how i can make this more smooth and beautiful??