What you ask for is the subject of this improvement bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=256718
but no one is working on it.
My first guess is that the way to do this is to add a template somewhere like template/en/default/bug/show.atom.tmpl with what you need. Put it in custom or extension as needed.
If you are interested in working on it or helping someone with it, visit the #mozwebtools channel on irc.mozilla.org.
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