Layout Grid: Allow to adjust columns/rows on component instances

Pretty excited about the new layout grid option, but it would be cool to adjust columns/rows count on component instance. That way we can come up with flexible placeholder components for table and form rows, where we have baseline component set up, and by changing, let’s say columns count on such component instance - add or remove nested components, swap them with other basic components, such as text, input, label, and span them to the desired amount