I have a JIRA filter which returns all the fixes in a future release:
project = MyProject AND fixVersion = \"1.1.1\" and issuetype in standardIssueTypes() and
I have a solution that requires no plugins whatsoever, but some manual work that is much better than listing the tasks in the query itself:
Using the linkedIssues function, you can write a query like so
parent in linkedIssues("PROJ-1061")
Now, link all the issues you want in this query to the PROJ-1061 and you're golden. You can do this in a bulk job, you can also add it as a trigger in a workflow potentially.