We have a bunch of parent tickets, each of which may have several subtasks. One of those subtasks should be - for example - a user testing subtask, flagged with a label like "UserTesting". I am struggling to come up with a query using Jira + ScriptRunner that finds all parent tickets that are missing a subtask with that specific label. I can come up with queries that show parents of subtasks where the subtask HAS a specific label, but I cannot figure out how to show the parents that are MISSING a subtask with a particular label. Any ideas on how to do this?