Ask HN: How to opt out of AI training in a license?

From my (quick) search, it seems like there's no readily available license (or some sort of standard clause) to prevent an openly accessible codebase to be used for AI training.

Does anyone know of any existing repository out there that states this in their license? Any advice on how to do it?

P.S.: I’m specifically looking for how to include this restriction in a license, I kindly ask stay on topic here.

Thanks in advance!