A family of Microsoft word processing software products for creating web, email, and print documents.
Current versions of Word support the insertion of WebP format. If the clipboard is not handling them, try right-clicking on the image on the web page. Choose Save Image As and save to your hard disk. Then in Word, choose Insert>Pictures>This Device and select the downloaded photo. Any better?
WebP does have file format variants, so it's possible that the Word import filter does not handle every variety of WebP.