Ubuntu 22.04
You simply need to installwebp-pixbuf-loader and make EOG the default program for webp extensions.sudo apt install webp-pixbuf-loaderUbuntu 20.04
For previous versions of Ubuntu you can add ppa:helkaluin/webp-pixbuf-loader PPA and proceed similarly.
sudo add-apt-repository ppa:helkaluin/webp-pixbuf-loadersudo apt updatesudo apt install webp-pixbuf-loader