OMG! Ubuntu! published a quick tutorial about how to add WebP support to Ubuntu 22.04 LTS.
How to Add WebP Support to Ubuntu 22.04 LTS
It's easy to enable WebP support in Ubuntu 22.04 LTS so you can see image thumbnails in the file manager and open WebP images in the default image viewer.
How to Add WebP Support to Ubuntu 22.04 LTS - OMG! Ubuntu!