We currently have multiple boards on a single project (multiple teams working in parallel on same product).
I know, it's possible to show the agile boards an issue is placed on:

My question:
Is the inverse possible? Can I display/search for issues NOT shown on any agile board?
Motivation:
While we need to continue working on multiple boards in the same project, we want to do housekeeping and assert, that these boards cover all issues in that project:
- every issue should be displayed on at least one board
- inform board responsibles, if an issue is displayed on multiple boards
(to prevent working in opposite directions)
(If necessary, I am not afraid to use automation rules or even export all board-issue-relations to programmatically compare them against all issues.)
Sunny greetings and thank you
Hartmut