CKFinder webp转换

I am struggling with using https://github.com/rosell-dk/webp-convert this package with CKFinder php plugin.

My CKFinder is located in /CMS/public/ckfinder My vendor libs are located in /CMS/vendor

The thing is when I try to use $success = WebPConvert::convert($source, $destination) within my CKFinder it fails and I have no error logs.

I found out that my PHP GD does not support imagewebp() -> is it essential for the package to work?

Thanks for any help.