Auto landscape material for mesh terrain

The only way to see displacement map of a material in path tracer is to apply it to a mesh with modeling tools.
...but it is not possible to apply displacement to a landscape object.
Auto landscape material (ex. brushify) are really good to build fast biome but they just apply to landscape (they are based on height).
Would be helpful (and possible?) an auto material that can work with mesh terrain and would be possible to apply the displacement map of that material (with modeling tools) to the terrain mesh before render with path trace?
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