How to force website use webp?

I use shortpixel lifetime plan, I use Wpwebhost WP Lite share server plan, use Nginx. I know this if shortpiexl plugin make my website use webp, have to do something in the Nginx backstage, however, my server company do not allow me change setting in the Nginx backstage. I want to know can I setup some wordpress plugin make sure website use webp to replace jpg(not including png.)

Thank you.