I confirm that sharing screen in Microsoft Teams works with Chromium Freeworld if you enable “WebRTC Pipewire support” via the option that @lteworte posted:
chrome://flags/#enable-webrtc-pipewire-capturer
Check also this guide:
https://uwot.eu/blog/microsoft-teams-on-fedora-and-wayland-with-screenshare/
Which was suggested to me by by @lightonflux in this topic