{
  "title": "Map Title",
  "root": {
    "id": "root",
    "type": "root",
    "text": "Center Node",
    "children": [
      {
        "id": "unique-id",
        "type": "phase",  // phase, category, item, plan, ideal
        "text": "Node text",
        "children": []
      }
    ]
  }
}

Node types: root, phase (bold), category, item (gray), plan (purple), ideal (blue)