https://wccftech.com/fallout-76-steam-overlay-mod/

A new Fallout 76 Steam Overlay Mod has been released which allows players to play the Bethesda.net exclusive with a Steam Overlay.

Bethesda’s online Fallout prequel is exclusively available through Bethesda.net and players are forced to use Bethesda’s own launcher to launch and play the game. Some prefer to use the Steam overlay to chat with friends or steam the game, and this Steam overlay allows players to do so.