This is will be killer feature, no one saftware for terrain generation does not have this.
One of the bigest problem of terrain creation is making masks for details, because users dont see the final color of terrain in software for terrain generations.
For first step only albedo (color map) will be enough. In the future you can add normal maps and roughness. But the biggest problem with albedo.
This is the same as color map of instant terra, but tiled textures in full resolution. Like terrain details in any game engine, but very simple implementation.