title: Adding an optional non-model field via Django core serializer
body: <p>I am trying to serialize a DJango queryset object.</p>
  
  <pre><code>data = Data.objects.filter(name__icontains='John')
  data_list = serializers.serialize('json', data, fields=('name', 'title'))
  return HttpResponse(data_list, content_type="application/json")
  </code></pre>
  
  <p>STDOUT of data_list</p>
  
  <pre><code>[{"pk": 4, "model": "XXX", "fields": {"name": "John ad", "title": "Mr. "}}]
  </code></pre>
  
  <p>In the output list I also want to add a dummy field with some hardcoded values.</p>
  
  <p>STDOUT of data_list</p>
  
  <pre><code>[{"pk": 4, "model": "XXX", "fields": {"name": "John ad", "title": "Mr. ", "Dummy": "Value"}}] 
  </code></pre>
  
  <p>Any help on how I should proceed or any links I should read would be appreciated.</p>