Any easy way to convert png to webp on Mac?

For image conversion, I always use the Preview app. However, it seems there is no export option for webp image format. When I open the .png files from the Preview app, the supported format within the export menu are only limited to HEIC, JPG, JPEG-2000, OpenEXR, PDF and TIFF.

How can I bulk convert png to webp on my Mac? The png images are too big for website pages and Google webmaster guidelines recommend using webp for fast page loading speed.

Thanks