https://www.chess.com/learn-how-to-play-chess En Passant is explained under section 3, "Discover The Special Rules."
I have gotten en passant in many of my games before, but I this probably isn't easily searchable via a database/archive, so I'll just show this clip instead for the super rare en passant checkmate!
I hope there’s a deep student of the game out there with answers because I’m losing sleep here. I even played a beginner bot with no purpose other than to create a position to play it. No such luck.