Megascans vertex blending + Rvt blending in ue4, plane landscape mesh + mesh- rvt blending

Two doubts:-
FIRST ONE–
#is it possible to do vertex blending and rvt blending together…?.
#is it possible to create a material for this…?. HOW ?
SECOND ONE–
#Rvt blending is limited to landscape terrian only…? Can we able to blend a mesh (eg: sphere) to a plane mesh (created in blender) in Ue4.? HOW…?
#i try to blend in this way (rvt blend on a plane landsacpe mesh) but, when i added rvt volume to plane mesh ,it disappears.
i will add screenshot of it…!