Caption for images

[zirkelc]

It's quite easy to implement caption for images:

n2m.setCustomTransformer('image', async (block) => {
  const { image } = block as ImageBlockObjectResponse;
  const src = image.type === 'external' ? image.external.url : image.file.url;
  const caption = image.caption ? image.caption[0]?.plain_text : '';

  return `
  <figure>
    <img src="${src}" alt=${caption} />
    <figcaption>${caption}</figcaption>
  </figure>`;
});

I was wondering why that's not the default behaviour?