Problem Definition

To find the issues inside an Epic users need to filter the story and then sub-tasks inside the retrieved Stories,

• "Epic link" in (Epic-1, Epic-2)
• parent in (<tasks retrieved on the query above>)

Suggested Solution

Add the ability to filter Story and Sub-task based on Epic link.
E.g.:

"Epic link" in (field = XYZ) and parent in ("Epic link" in (field = XYZ))

Workaround

N/A