Adding "Math.floor(Math.random() * 6000)" to wait field using javascript before the </body>

So, my knowledge of javascript is still pretty limited, so forgive me for pushing, but this just looks to me like json, right?

I just want to replace the circled value with “Math.floor(Math.random() * 6000)”. That seems like a typical javascript thing to do to me, I just don’t know how to target the value… what makes it so this can’t be done? Limitations of javascript or limitations that Webflow has built in to their webflow.js file?