Hello

Thank you for your query. Could you please check out our blog link below regarding the WebP images in Joomla?

https://www.joomshaper.com/blog/how-to-use-webp-images-in-joomla

SP Page Builder has native support for WebP images, as you know. In order to use this image format, you need WebP format support in your GD library on your server. After that, you can head to any of your SP Page Builder pages, and insert an image addon to see how it works.

You can check out the blog link that I have shared for more details and steps on how to insert and use the WebP image.