Thank you for the clarification. You may be able to perform this with an add-on as the Epic Link field will need to be provided a key.
The other way you can find all Epics under a Project is with a query such as the following:
project in (ProjectName) and issuetype = Epic
The issue with that is you want to use the Epic Link which is a custom field and a relational link to determine an issue's parent epic.
If you would like to find the all the issues in the Epic Links you'll have to specify each of the Epics as there isn't a native way in JIRA to do so. This could also be possible with an add-on such as ScriptRunner.
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