Is it possible to get terrain tools on imported terrrain ?

Hello.

Is it possible to use build in terraint tools (for example painting trees on to a terrain) on a low polygon terrain that was created and textured in Blender ?

For example if i want to have lots of trees and grass on the low polygon terrain is it possible to use Unity’s built in terrain tools ? or do i have to place them manually one by one ?

i have tried searching in the Unity documentations and Youtube and didn’t find anything.

I may be wrong though but I don’t think that is possible.
You can however create a terrain then convert it to mesh for reducing the polygons using some assets in unity3d store.