title: How do I create JSON array using QT
body: <p>I want store my datas in JSON file like:</p>
  
  <pre><code>{
      "plottingData": [
          {
              "min": 17,
              "max": 35,
              "mean": 20
  
          },
          {
              "min": 7,
              "max": 35,
              "mean": 17
          },
          {
              "min": 8,
              "max": 50,
              "mean": 29
          }
  
      ]
  }
  </code></pre>
  
  <p>How can I create this struct? 
  I used to QJsonObject but I couldn't add QJsonArray like this.</p>