Foliage Painting on massive landscapes

I’ve been trying to place grass all over my terrain and my terrain is massive so trying to do that would take months at best any idea on how to just play it all over the terrain with out having to do it with the foliage tool?
ive been searching for ages for an answer but i dont think theres anything that allows me to do that?
even using weight maps to place it would be amazing.

Duplicate Post: Foliage Painting on massive landscapes - World Creation - Epic Developer Community Forums