I have been trying to do what seems like a simple idea - report on the number of open tickets per Epic. It's my first time using dashboard so maybe I have missed something but I found the Issue Statistics widget, and provided an appropriate filter. However the widget will only allow me to group issues by Parent (so sub tasks get grouped into stories but not Epic) or Epic Link (which seems to be deprecated so sub tasks get grouped under "none" despite their parent being in the right Epic).
Is there another way of providing these counts?
Any recommendations for plugins for better reporting? Ideally I'd love to be able to split at least another level on this, showing number of tickets by Epic, label (for team ID) and status.