Hello,
Sorry for joining late to the discussion. As far as I know, the only way to do this currently is by using this app Power automate integration and then setting a flow on Power automate (paid subscription). It is a little bit of work and you need to pay all those additional apps. I hope monday.com adds this to the outlook integration catalogue soon because it seems essential to me!
If you want to support this idea you can vote for this feature here!
Outlook Integration for Flagged Email