We are getting closer, and are still working thru some bugs, but hope to release this as part of a Public Preview pack in early 2021! (Windows 10 released with the December 2020 pack this week)
You can learn more about the new Microsoft Teams Public Preview program here: https://aka.ms/TeamsPublicPreview, and Teams administrators can find documentation to manage which users will see the Public Preview option here: https://aka.ms/TeamsPublicPreviewAdmin
An error occurred while saving the commentAnonymous commented
I've gone through and enabled this setting through the Developer tools as described below. I understand that this implementation might not be fully complete yet, but what surprises me is that while messages now use the native macOS notification system: a) they don't show the sender's name, if they're messaging from a group chat, and; b) the notifications for incoming calls still uses the non-native implementation, which means that they don't respect DND or appear across screens/Spaces consistently.
Seems pretty half-baked so far.
This item is still under consideration by the feature team.