I would like the ability to generate a "Relationship Tree" (similar to a mindmap view) whereby you could lookup a primary ticket and map the relationships to that ticket (including the type/name of relationship), then map the relationships of each the related tickets to their relationships and so on. This would be very helpful from a portfolio level to see what projects relate to a certain program, then what increments are related the projects, what user stories are in each increment, etc. It would be helpful even just to track all of the related work that is spread across multiple teams/spaces.
It's currently not possible to have this kind of visibility. Options are very limited because:
(1) it's not feasible to treat each layer as a subtask, and
(2) you cannot see the relationships unless you open each task individually
(3) you cannot link to an entire list of tasks, or all lists within a folder if you were to organize work that in project lists or folders