tried two ways. added a coliseum and drew grass with an ordinary standard tool. Then combined the surface and grass with merge actor and add result into BP.
This method works. but it does not bother to add new objects. for example, how to build a building in a strategy. as these objects will hang in the air and not move with the platform.
if you just lay the foliage on top, then in this case it also does not move. Is it even possible to do so?