title: Jackson Serialize without field name
body: <p>This is slight extension of my <a href="https://stackoverflow.com/questions/36340655/java-jackson-serializer-grab-variable-name">previous question</a>. So based on dambros' answer, the json now looks like:</p>
  
  <pre><code>"Foo": {
      "title": {
          "type": "title",
          "value": "...",
          "variable": "..."
      },
      "message": {
          "type": "message",
          "value": "...",
          "variable": "..."
      }
  }
  </code></pre>
  
  <p>But what I really want is:</p>
  
  <pre><code>"Foo": [
  {
      {
          "type": "title",
          "value": "...",
          "variable": "..."
      },
      {
          "type": "message",
          "value": "...",
          "variable": "..."
      }
  }
  ]
  </code></pre>
  
  <p>Is there any way to write the <code>Foo</code> field as an array and also not display the variable names as fields (i.e remove <code>"title" :</code>).</p>