Finally this plugin solved my problem. Usually when I got a webp images downloaded from internet, I take a screenshot of the image and copy and paste it inside Photoshop.
But lucky me I found this plugin from this link: https://endurtech.com/how-to-open-webp-files-in-adobe-photoshop/
Extract the file, and find 32 or 64 plugin file, copy and paste it on your Photoshop plugin directory. Enjoy!
Here is the link to the plugin, I stored it in my Google Drive: https://drive.google.com/open?id=103UEWqBwdVrxsCmLQ4ZBUd9FfKO0RQPG
Don’t forget to check that original link above.