Pop up button that can be added to objects to provide more info (otherwise hidden)

It would be so helpful to have a function that would enable one to add a button (or, less ideally, a roll-over) that let’s users learn more detailed information about an object. E.g., in developing a high level strategy chart, the team could add a pop-up that provide the rationale for a strategy action without cluttering the high-level strategy chart. Please!!