Hello. Thank you for your help.
I set up a filter using a JQL query "Parent" in (ABC-1234), where ABC-1234 is the Jira Initiative.
The filter returns all the Epics linked to my Initiative.
When I use the filter as a data source in a Jira Plan, my Epics show up in the plan but, here is the problem.
They show up as "issues without parent'.