I'd like to know if there's a way to check if some tests in XRay haven't been added to any Test set. As is, the only way I've managed to compare if there are any tests missing from our tests sets, has been by calculating the total number of tests in Test executions which have been created from the Test sets and comparing that to the number of Tests we have in the XRay library/repo.
It would be really helpful if I could, e.g., add 'Test set/Test plan/Test execution' columns to the JQL search table to easily search for tests where the value is EMPTY.