That's a neat feature that I didn't even know existed. Sure enough, fives seconds on a random qr code site (https://www.qrcode-monkey.com/#vcard) and my iPhone's camera offered to add it as a contact. I wonder why this isn't first-class (in terms of exporting); something I can expose directly as "this is me" or to pass off an existing contact via a quick visual swap.

I guess I'll generate one for me and store it in the notes app, which is sort of a catchall for this sort of thing.