Probably not the smartest move to bring this out, while all attention is to the newly released S22, but here goes.
NEW in beta 3:
The original plugin allowed to copy and paste a single extract. With the latest version you have up to 5 slots to hold an extract.
Select a slot in the Attribute Manager to use. If the slot is empty you obviously can only use it to copy an extract into. Once a slot is filled you can then use it to paste/inject into your mesh.
The new version also allows to use selected edges around a hole in the mesh in order to paste the selected extract.
You do not need to be in edge mode to be able to use edges, nor do you have to be in polygon mode to use polygons. Although it helps in visualizing which edges or polygons are selected if you are in one or the other mode. For now, I do not limit to use edges or polygons to a particular mode. Depending feedback I might provide this limitation if it is more appropriate.
And as pictures tell more than many words, I have created a short video to demonstrate the process ...