title: convert complex/nested json object to excel table
body: <p>I've got a nested json object. For the sake of simplicity:</p>
  
  <pre><code>data = {'key1': 1, 'key2': 2, 'key3': {'nestedKey1': 3, 'nestedKey2': 4}}
  </code></pre>
  
  <p>A real object is bigger but the point is that it's a nested one. Values may be strings, numbers or other objects.
  Now I need to get an excel table that (for this specific json would look like this):</p>
  
  <pre><code>|----------------------------------------
  | key1 | key2 |           key3          |
  |      |      |--------------------------
  |      |      | nestedKey1 | nestedKey2 |
  |----------------------------------------
  |  1   |  2   |     3      |      4     |
  |----------------------------------------
  </code></pre>
  
  <p>Other formats are also acceptable. But this one is most preferable. How do I do that?</p>