test.js

{
     type: "matrix",
     columns: [
      "Grade A",
      "Grade B",
      "Grade C",
      "Grade D",
      "Grade E",
      "Grade F",
     ],
     name: "question3",
     rows: [
      "Topic 1",
      "Topic 2",
      "Topic 3",
      "Topic 4",
      "Topic 5",
      "Topic 6"
     ],
     isRequired: true,
     validators: [
      {
       type: "answercount",
       maxCount: "6",
       minCount: "6",
       text: "Footext"
      }
     ]
    }
   ]
  }