How to output WebP from Photoshop
Here I use a plugin which is still very much in development to output WebP images from Photoshop. I will also show the alternative method of converting images to WebP using Squoosh.app
GitHub
https://github.com/webmproject/WebPShop
EWWW IO plugin for WordPress
https://ewww.io/plans/ref/211/
Google's Squoosh App
https://squoosh.app/