Is there a way to see the number of tickets that span releases?

We use fix versions to tag epics (and others) to a quarterly release plan. At times we miss delivery and we add another fix version to show it is now a part of a new quarter plan.

Example:
UNI-1 is slated for Release 2020.1. It was not finished in 2020.1 and will be finished in 2020.2.

UNI-1 has Fix Version = 2020.1.

PO adds Fix Version 2020.2 to UNI-1, so now 2020.1 and 2020.2 are in the Fix Version field for the ticket.

I’d like to be able to report on the number of tickets that span multiple releases; what is the easiest way to do this?

Thank you!