Hi @patrickzw
If i remember right from the recent GDC videos that it was mentioned that currentyl PCG editor only right now, this may change on release of full 5.2 or even 5.x.
I wouldbt be using it for anything substantial right now IN GAME anyway as they have said numerous times it could change, just like the new Strata/Substrate materials. They are still work in progress so beware.
BUT i might be wrong if anyone else can clarify?