since you have scriptrunner installed you can use
issuefunction in linkedissuesof("issuetype = epic and fixversion =ABC_123")
the second one should be optional linkedIssuesOf(Subquery, [link name]) see :https://jamieechlin.atlassian.net/wiki/display/GRV/Scripted+JQL+Functions#ScriptedJQLFunctions-linkedIssuesOf(Subquery,[linkname])
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The second one is optional as of some version... either update your SR, or you need to specify the link name.
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"is Epic of" or "has Epic" for the second argument, can't remember which.
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Would this suffice?
fixVersion = ABC_123 and "Epic Link" is not EMPTY
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