The latest Bifrost version dropped with the first modeling nodes. I hope there is more coming. There are a lot of nodes for TDs but we need more for Artists. First try to get an extrude from a plane.
Not at the moment cause some nodes are missing. But you should be able to select edges based on angle and store that info in a component tag. I assume we get more modeling nodes with the next update. A TD could do it right now.