A document with only one tab, with a single Title input for the writer

sample.json

{
  "Main" : {
    "title" : {
      "fieldset" : "Title...",
      "type" : "StructuredText",
      "config" : {
        "placeholder" : "Type the document's title here",
        "single" : "heading1"
      }
    }
  }
}