If I’m not mistaken this was being developed as a plugin called “Editable Mesh”](https://github.com/EpicGames/UnrealEngine/tree/master/Engine/Plugins/Runtime/EditableMesh) which has a library of Blueprint nodes used to edit meshes programmatically. It hadn’t seen much progress for a while until somewhat recently when Chaos started using it to fracture geometry caches. However, it looks like earlier this year they stopped working on this Editable Mesh plugin and started fresh with a new one called “Geometry Processing”](https://github.com/EpicGames/UnrealEngine/tree/master/Engine/Plugins/Experimental/GeometryProcessing)
It seems to have a lot of work being done on it recently probably due to Chaos, so I’m pretty hopeful we’ll see this come to light within the next few engine versions.