I wrote about this a while back. It was beta at the time but hope it might help:
Your blog post pointed me in the right direction and worked like a charm.
I am looking into writing a custom query that works with content approvals.
I have been reading the documentation from optimizely which talks about writing a basic query https://world.optimizely.com/documentation/developer-guides/CMS/user-interface/extending-the-tasks-pane-with-custom-queries/.
I want to be able to re-create the 'Awating Your Review' query however I just can't seem to get the results to match.
Has anyone else tried this?