How to retrieve the image of an RSS Feed?

I created a JS code, but cannot retrieve the url of the images from my RSS Feed.

How to retrieve the image of an RSS Feed ?

const FEED_URL = https://www.s1biose.com/fr/test/rss.xml;

fetch(FEED_URL)  .then(response => response.text())  .then(str => new window.DOMParser().parseFromString(str, "text/xml"))  .then(data => {    const items = data.querySelectorAll("item");    let html = ``;    items.forEach(el => {      html += `<div class="card mb-3 text-start position-relative text-dark"><div class="row g-0"><div class="col-md-4"><img src="${el.querySelector("enclosure").innerHTML}" alt="${el.querySelector("title").innerHTML}"></div><div class="col-md-8"><div class="card-body"><div class="card-title h5">${el.querySelector("title").innerHTML}</div><p class="card-text">${el.querySelector("description").innerHTML}</p><p class="card-text"><small class="text-muted">${el.querySelector("pubDate").innerHTML}</small></p></div></div></div><a href="${el.querySelector("link").innerHTML}" title="${el.querySelector("title").innerHTML}" class="stretched-link" target="_blank" rel="noopener noreferrer"></a></div>      `;    });    document.querySelector('#feed').insertAdjacentHTML("beforeend", html);  });