use query results as input parameter for a second query

[Michael Lichtenstein]

For example, Our organization wants us to list both all of the epics and user stories for a given feature.  To do this I have to write two queries.  The first is to list the epics that are part of the feature, which is easy b/c I add a label to each epic that names the feature for which it belongs (labels="feature-abc").

To list all of the user stories, I have to manually enter all of the Epics ("Epic Link" = "Epicname" or "Epic link" = epicname2, etc...)

I want to write a query that takes the results of the query used to pull epics for a feature as input into the query that pulls user stories.

[Walter Buggenhout]

You can't do this with out of the box functionality in JIRA. There's add-ons that support you to do this with advanced functions, like scriptrunner.

If you have that on your instance, have a look at this page and look for the function IssuesInEpics.