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I wouldn't recommend using webp images. They are not supported in the epub2 or epub3 specification. The four supported image formats are gif, jpeg, png and svg/xml. Using other formats can and does cause issues on quite a few ereaders and will get your ebook bounced from Amazon, Smashwords, etc. One author I did some work for insisted on using webp images and got rejected on multiple sites for that reason.
For a personal use only document, knock yourself out. But please don't waste other people's time by complaining that a program is attempting to follow the standard to allow generating an ebook that will work on the majority of devices, however much you feel that your preferred image format should be supported.
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