In Canary build 91.0.830.0, I got the feature 'Office Viewer'. The feature allows you to view Office documents quickly in Edge without needing to download them and open using Office apps or Office Online. The feature fetches the documents from the internet and quickly opens them in the browser.
Loved the feature, this truly sets it apart from all other browsers!
If you receive the feature, the toggle is present in the Settings > Downloads.
This is in CFR, because I saw it previously on Reddit.
Word document in Edge opened with Office ViewerPresentation from the web in Office ViewerSettings toggle