title: Jira JQL - Show all issues by Epic assignee
body: <p>I am using a vanilla version of Jira (I can't install any add-ons - it's company wide).</p>
  
  <p>I'm trying to filter to show all issues for a given team. The ideal way to do this IMO is to assign their team leader to their epics and have Jira filter to show all the issues within that set of epics.</p>
  
  <p>So far, I've hit a brick wall. I can easily setup a filter to return the epic for a given user - or return all tickets assigned to a user generally. However, I cannot seem to return all tasks related to all epics of which the specified user is the assignee.</p>
  
  <p>Any help is hugely appreciated.</p>