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One issue is if the software you are using to read your ebooks is able to display WebP images. Most ereaders and quite a few applications I've tried are not happy with WebP images.
For ePub2/3, png, jpg/jpeg, gif and svg are the only supported image formats.
As for that space saving on conversion, my testing has never managed close to the ~90% reduction in file size you show when converting jpb to WebP. The average saved was closer to 25% when I choose to maintain image quality. Oddly, using lossless recompression on the .jpg can give close to the same reduction in size depending on the original image.
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