The feed search dialog (c.f. https://phabricator.kde.org/feed/) offers a checkbox to "Include stories about projects I am a member of." This should be generalized to all line edits, as it would be very useful in other searches as well. I imagine some kind of special entry, similar to the "Tagged: <...>" entries when searching for repositories.
I would like to use that to build a personalized dashboard for developers that shows all review requests for projects that one is member of, paired with their activity and other potentially useful information.