How to fetch vertex/index information from UFlexComponent after start simulation (in C++)?

Question about NVidia FleX in UE4.
https://github.com/NvPhysX/UnrealEngine/tree/FleX-4.16.0

How to fetch vertex/index information from UFlexComponent after start simulation (in C++)? I want convert data from UFlexComponent to UProceduralMeshComponent for use SliceProceduralMesh method.