JSON mask for the "about" content type in the front-end-only example

portfolio.json

{
  "Main" : {
    "title" : {
      "fieldset" : "Title of the project",
      "type" : "StructuredText",
      "config" : {
        "single" : "heading1"
      }
    },
    "image" : {
      "fieldset" : "Image",
      "type" : "Image"
    },
    "section" : {
      "fieldset" : "Portfolio section",
      "type" : "Link",
      "config" : {
        "select" : "document",
        "masks" : [ "portfolio-section" ]
      }
    }
  }
}