i got the answer, for the animated webp image it's same mime type "image/webp.wasticker" only catch is you have to change the metadata of that webp that compatible for whatsapp. follow this link to change your animated webp metadata, it just add
pack: 'My Pack', // The pack name
author: 'Me', // The author name
type: StickerTypes.FULL, // The sticker type
categories: ['🤩', '🎉'], // The sticker category
id: '12345', // The sticker id
quality: 50, // The quality of the output file
background: '#000000' // The sticker background color (only for full stickers)