This article explains how to configure reports to show Epic issue field details in the linked issues.
Instructions
Navigate to AIO Reports → Custom Report → New Report
Add field Epic Name & other fields(as per your requirement) to your report.
Configure the Epic Name field as shown below to choose to Roll up option
Run the report to get the required data.
Ensure to have proper permission to create AIO Report.
You can customize the report by adding new fields.