On Sunday, Chrome Story, a Chrome and Chrome OS-focused blog, spotted an "add feature flag" in the Chromium Gerrit referencing an addition to Nearby Share called Self Share.
As noted by Chrome Unboxed, Self Share must still go through the Chrome OS Canary developer flag stage before regular Chrome OS users will see it on their devices."If you enable the flag, or if you wait until the feature becomes available, a new 'Send to Your Devices' menu option will appear once you press 'Nearby Share' on the Chrome OS Share Sheet," Chrome Unboxed wrote.