One thing it would need to if we do something like this is a way to bypass the check. Occasionally a JIRA isn't required for a PR. For example the WildFly Core upgrade in WildFly full we don't generally file a JIRA for.
This is surely doable, but I would argue that this should be clearly stated for instance in the PR title or description (e.g., "[NO JIRA] Subject" or similar). In that way, the check won't be set up.