How to pass a variable into "issue in childissuesof("[issuekey]")"

[Jeff Guthrie]

I want to filter on all issues of a group of projects that belong to Epics that are in a particular release.  

project in (PROJ1, PROJ2, PROJ3) AND (issue in childIssuesOf (issuetype in (Epic) and fixversion in (2021-PI1)))

[Kian Stack Mumo Systems]

@Jeff Guthrie, you cannot provide a function inside of the childIssuesOf function. I see that you are using a server Jira. Do you have Scriptrunner at all? Scriptrunner has some nested function abilities which might be helpful in this case.

Thanks,

Kian