FR: JQL ability to target "epics which I've worked in"

[Seph Reed]

This is a feature request.  The likely solution is a new function like `closedSprints()`, or others.

What I'm trying to do is create a feed which keeps an eye on tickets within Epics that I currently working in.  I want to be able to share knowledge with the tickets I'm likely to have knowledge on (ie adjacent to my assignments).

If there was such thing as "SELECT x FROM" in JQL, it would look like so:
`"Epic Link" in (SELECT "Epic Link"  FROM assignee in (currentUser()))`

Given I'm not a core designer of this product, I will give no suggestion on how it could be done, and I hope that these details are enough to understand the request.

[Seph Reed]

Another way this could be done is

`inWatchlistEpic()` where users could add an epic to their watchlist, then filter for tickets within watch list epics.