Addition to my last post because there is no “edit” button:
You’re able to create your webp-image and just rename it. Eg from img01.webp to image01.jpg and ghost is able to use the image. When you check your browser (developer tools) you can see that a webp-image is returned and the metadata is correct, too. Even if there is a wrong extension the browser is able to display the image. So you can (temporary) bypass the “only extension gif, jpg, png… are supported” error message.
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