Yes, I have found out a few things. The plugin chooses faces of grouping level-1, where the part is 18 mm (adjustable through settings). If you try to group two grouped objects or components it won't work, the plugin only process whole faces on level-1 groups or components. If you make it an component, you can name it and the plugin prints the name within the part on the layout.
I've gotten around to start to like working with Inkscape. It was an relief to find out that I could work in mm instead of px, through document settings, in the menu.