Adding decimal separators to a YouTube view count retrieved via API

I'm trying to retrieve a YouTube view count for a specific video on my Wordpress site. I'm not a coder but I've managed to get it working using this code:

<div id="viewCount" style="display: inline-block;"></div><script>       let getviewCount = () => {        fetch(`https://www.googleapis.com/youtube/v3/videos?part=statistics&id=Cemk32wKN_k&key=XXXXXXXXXXXXXXXXXXXXXXXXXXXXX`)        .then(response => {            return response.json()        })        .then(data => {            console.log(data);            viewCount.innerHTML = data["items"][0].statistics.viewCount;        })          }    getviewCount(); </script>

The final touch I'd like to add is decimal separators so instead of the number looking like this:

13526897

It looks like this:

13,526,897

Based on some research here I think I need to use a function similar to this:

function numberWithCommas(x) {    return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");}

But I don't know how to code, so combining these two ideas is beyond my ability right now.

If anyone wouldn't mind showing me how to do it, I'd be extremely grateful!

Thanks