I don’t know what a .webp file is but I don’t like it. They’re like a filthy prank version of the image/gif you’re looking for. They make you jump through all these hoops to find the original versions of the files that you can actually do anything with.
WebP is awesome (JPEG-XL is awesomer though). It compresses better than JPEG which was introduced 30(!) years ago. It’s time for JPEG to go away.