We have an internal process whereby after bugs are closed, another team reviews for automated testing. In order to see a list of bugs that need reviewing we use labels and the issue filter. However we can not add labels (or make any edits) without reopening, then closing the bug again, which is tedious.
Paulo's suggestion does open up your issues to all edits - the other option is to have a transition from closed to closed, with a screen on it that allows the user to update whatever fields you want to allow them to change.
It might also be worth a look at your process - should you really be reviewing closed stuff for automated testing? That comment suggests that you haven't really finished with the issue and it's not at its real end point - consider changing the "closed" status to something showing "review for automated testing" and then having "closed" after that when they decide it doesn't need it, or they've dealt with the testing.
The reason closed tends to have edits disabled (and I tend to do it to comments as well) is that a closed issue really is ended - the desire to edit or comment on it strongly suggests it has not been finished, and it should be re-opened to show that it wasn't done with!
By default, JIRA has a paramater in the Closed status which does not allow the issue edition, but you can remove it off as described in the following link:
I always suggest to keep this "Lock Close Issues" option in place. I urge you to leave it there and let closed issues be closed. The intentions for solely updating certain closed tickets so that it can be easily queried is not enough to remove this restriction which will lead your other tickets open to vulnerability.
What I will suggest however is to tackle your problem in a different way. A couple of suggestions:
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