Not even gonna.The DCEU wiki considers this canon.
It's from a comic called "Serving Up Justice".Serena Jameka Williams is a professional American tennis player who, at some point, was attacked by Retrobots during a tennis match, meeting an alternative version of herself known as Wonderous Serena while she traveled to a parallel dimension. During her trip, she found a child named Mikayla...dcextendeduniverse.fandom.com
To be fair, she recognises the alternate Diana Prince as Wonder Woman, so her universe does seem to be the DCEU.
You can read it here.