Is there a report that will tell me what Requirements in Jira do not have a Test case assigned?

Thanks for the info.  I just wanted to be sure I understood the request.  Unfortunately it's a problem: we can report coverage from Zephyr to Jira, matching existing test cases to an issue but we can't report in the opposite direction which would need access to the Traceability section.  That's not currently possible - not even using JQL.  This info is from memory of trying in the past to do something similar like this, but I'll have another think on it.