Hi @TEMPVIMAE -- Welcome to the Atlassian Community!
How often do you need to do this, and do you have funds to purchase marketplace addons?
Vanilla JQL doesn't support it. You can export your issues to spreadsheet and process the data there. Obviously it only works for one off jobs.
You can find such epics with our app JQL Search Extensions.
If you install it you'll be able to perform this search:
issuesInEpicCount = 0
I hope this helps!
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