In a specification window for a given element, I am able to navigate to the Property Group called "Usage In". This displays a number of different classes of elements. I need to find a way to use a structured expression (or API call!) to return these elements as a set in a generic table column. Thoughts on how to do this? The OpenAPI does not unfortunately seem to have a "element.getUsageInElements()" call (which would be super duper helpful, please can we have simple things like this?).