There is any easy/quick way to create groups of primitives from material assignments?

I have a geometry (external .obj file) with already done handly selections of primitives. From DataTree > Material stylesheet I can see which polyislands id are assigned for each material, but I would like how to ‘transfer’ this data in quick way.

In essence I'm finding something like to extract from clusters, or separate meshes from material.

Thanks!

Something like this