Feature Description

Currently, if a site enables the site health check for WebP images, but the site's hosting provider does not support WebP, the only feedback we provide is the following message:

WebP support can only be enabled by your hosting provider, so contact them for more information.

This doesn't give site owners a lot of information to help resolve the issue. Instead, it would be nice to include a link to some documentation that includes minimum requirements to support WebP that could be copy/pasted to hosting support, or could help self-hosting developers figure out why this isn't working.

In the announcement post for the inclusion of WebP images in WP 5.8, @adamsilverstein included the following:

WebP support in the media library requires that your web server’s image processing library (WordPress supports both Imagick and LibGD) supports the WebP format. Fortunately these libraries have supported WebP for quite a while so support is widely available. If your web server does not support WebP, you will see an error message when you try to upload a WebP image.

However, this doesn't give any specifics. Is there a canonical reference somewhere that we could point to?