You’re going to have a very hard time doing this inside Vision. Java Swing really wants tables to be in a pretty strict 2D format.
Within Vision, I would probably try to implement this entirely as “custom components” (i.e. templates) inside the template canvas, taking advantage of MigLayout.
Another approach would be a custom module dropping in a new Vision component entirely, though. You could possibly achieve something close to the desired output using a JXTreeTable (think the tag browser, or the new Configuration Explorer for what that looks like).