On July 20th 2021, assuming everything goes to plan, WordPress 5.8 will be released with full support for WebP images.
You can read all about that here:
https://make.wordpress.org/core/2021/06/07/wordpress-5-8-adds-webp-support/
If you like you can use the beta testing plugin to test it out on your WordPress site if you can’t wait until it’s released.