Javascript 使用sendMediaGroup发送图像

如何使用sendMediaGroup发送照片？ 我读了电报api，但无法形成请求

取回邮递员：

  var myHeaders = new Headers();
  myHeaders.append("Content-Type", "application/javascript");

  var data = {
    chat_id: 11111,
    media: [
      {
        type: "photo",
        media: "https://picsum.photos/200",
        caption: "It's picture",
      },
      {
        type: "photo",
        media: "https://picsum.photos/200",
      },
    ],
  };

  var requestOptions = {
    method: "POST",
    headers: myHeaders,
    body: data,
    redirect: "follow",
  };

  fetch(
    `https://api.telegram.org/${botToken}/sendMediaGroup`,
    requestOptions
  )
    .then((response) => response.text())
    .then((result) => console.log(result))
    .catch((error) => console.log("error", error));
},

响应：“错误请求：需要参数“媒体”

我做错了什么