Hi @admin_jira1 , welcome to the community.
Unfortunately, there isn't a good way to do this is a Jira instance without add-ons. It's not possible to specify something like the number of issues linked in a JQL Search, so we have no way to identify this otherwise.
It might be possible to do this kind of search with the help of Scriptrunner, but it would likely take some custom development work.
The best thing to remember here is that JQL is designed to search for contents of a field, so it gets easier if you have some calculated field that is just the number of children of the Epic. That is the direction I would look in for this solution.
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