{
  "text": "[^1]\n\n[^1]: foo",
  "tokens": [
    {
      "type": "paragraph",
      "children": [
        {"type": "footnote_ref", "key": "1", "index": 1}
      ]
    },
    {
      "type": "footnotes",
      "children": [
        {
          "type": "footnote_item",
          "children": [
            {
              "type": "paragraph",
              "children": [
                {"type": "text", "text": "foo"}
              ]
            }
          ],
          "key": "1",
          "index": 1
        }
      ]
    }
  ]
}