[
  {
    "name": "columns",
    "type": "list",
    "label": "Columns",
    "importance": "high",
    "max": 4,
    "field": {
      "name": "column",
      "type": "group",
      "importance": "high",
      "fields": [
        {
          "name": "width",
          "label": "Width",
          "type": "number",
          "description": "Column width in percentage.",
          "optional": true,
          "max": 100
        },
        {
          "name": "content",
          "label": "Column",
          "type": "library",
          "options": [
            "H5P.RowColumn 1.0"
          ]
        }
      ]
    }
  }
]