title: Zapier form dynamic inputFields manipulation
body: <p>I'd like to manipulate the input fields of a trigger form dynamically:</p>
  
  <ul>
  <li>I have a trigger 'hidden' with a combo-box in a form</li>
  <li>Each time I update the combo, it should add one or more combo-boxes in the same form depending on the value</li>
  </ul>
  
  <p>I couldn't find any way to access the <code>operation.inputFields</code> somewhere for doing an update on this list dynamically, whether via the <code>bundle</code> or else...</p>
  
  <p>Here is the small example: <a href="https://github.com/nuxeo-sandbox/nuxeo-zapier/blob/spikes-NXP-26085-zapier/nuxeo-zapier-app/triggers/project.js#L8-L16" rel="nofollow noreferrer">https://github.com/nuxeo-sandbox/nuxeo-zapier/blob/spikes-NXP-26085-zapier/nuxeo-zapier-app/triggers/project.js#L8-L16</a></p>
  
  <p>Thank you for your help!
  Vlad</p>