如何将<img>对象用于JSON src标记？

// 前端代码
function getBase64FromImageFile(file) {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => resolve(reader.result);
    reader.onerror = error => reject(error);
  });
}

const inputFile = document.getElementById('imageInput');
const imgObj = document.getElementById('imageObject');

inputFile.addEventListener('change', async (event) => {
  const file = event.target.files[0];
  const base64String = await getBase64FromImageFile(file);

  const json = {
    src: base64String,
  };

  // 发送json对象给后端处理或存储
});

// HTML代码
<input type="file" id="imageInput" accept="image/*">
<img id="imageObject">