Modifying Array inside a map/promise (Javascript)

In the code provided below, I would like to modify the 'image' field of each object (article) stored in the 'articles' array. I know that I can create an empty array and push a deep copy of each article one by one using the spread operator as described here. Is there any way I can change the contents of the array 'in place'? I have tried passing articles as a third argument, and I'm still not able to modify the 'image' field of each article stored in the array. Thanks in advance.

let requests = articles.map((article, i)=>{
     return new Promise((resolve) => {
          articleImage.findById(article.image, (err, theImage)=>{
               if(err) return res.status(400).send(err);
               articles[i].image = theImage.source;
               resolve();
          });
     });
});
Promise.all(requests).then(res.status(200).send(articles));