"Epic Link" in ('') expects issue keys, e.g. "Epic Link" in ('KEY-2', 'KEY-5')
Filters do not return issue keys so this will never work in JQL. You would need more "sophisticated" functions such as 'issueFunction in linkedIssuesOf('project= EPICPROJ', 'is Epic of')'
Such functions are specifically tailored to find you linked issues of an Epic based on a "subquery". (Above example is from ScriptRunner plugin out of box JQL function).
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