This is a standard feature of Shopify Products, the ability to Add not just jpeg but also WebP images. This is a bug that needs to be fixed please ASAP.
Hi Edward C,
Hope you're having a great day! This is Charles from GemPages, and I just wanted to thank you for sharing your suggestion.
I'm excited to let you know that we've taken it on board. You'll be able to add Webp images to your pages starting next week. I'll be sure to drop you an email as soon as the feature is ready.
Your ideas are always welcome, and we'd love to hear more from you. See you soon!