Is FaunaDB a good fit for storing large documents?

I’m building a collaboration ready editor, I’m planning on using TipTap. The output of the editor is in the below given json format

{
  "type": "doc",
  "content": [
    {
      "type": "heading",
      "attrs": {
        "level": 2
      },
      "content": [
        {
          "type": "text",
          "text": "Export HTML or JSON"
        }
      ]
    },
    {
      "type": "paragraph",
      "content": [
        {
          "type": "text",
          "text": "Hello from Tiptap."
        }
      ]
    }
  ]
}

Would Fauna be a good fit for storing whole documents like this ?

Fauna can store pretty large documents (limited by request length, 2MB AFAIK), but I am not sure about pricing, because every 4kb is counted as one read.