[out_of_protocol]

https://caniuse.com/avif - 87% penetration. JpegXL have about zero (actually 5% - safari). So, in practice, you can't use it

[atemerev]

But it has a great advantage: it is not made by Google (which also is probably the reason why it is not adopted too widely).

I am trying to minimize using things originating from Google.

[lifthrasiir]

A bad news for you; it was made by Google, partly (Google Zurich and Cloudinary). It wasn't adopted probably because it didn't originate from the Google Chrome team.