I see in the docs here https://www.sidefx.com/docs/unreal/_attributes.html [www.sidefx.com] , the unreal_foliage.

Im having trouble finding tutorial showing how its used .

Do i just scatter points and give them the interger value of one with the "unreal_foliage" string ?
And what does this do when bringing it in to Unreal ?

By default, instances are just regular instanced static mesh components on an actor. With unreal_foliage = 1 they are added to the levels foliage system instead, which you can see when you go into the Foliage editor mode. If your unreal_instance attribute points to a Foliage Type object, it is treated as foliage automatically.