title: Get updated field values from react-jsonschema-form
body: <p>I am using react-jsonschema-form to dynamically generate form fields. I am using this to generate only few additional fields in a form. Therefore I'm not using submit function in react-jsonschema-form. Instead I submit generated field values also with my form.</p>
  <p>I am using this state hook to store the values of updated properites</p>
  <pre><code>const [additionalData, setAdditionalData] = useState(&quot;&quot;)
  </code></pre>
  <p>What I want to do is update value of additionalData from onChange in react-jsonschema-form.</p>
  <pre><code>function getTemplateFields(data: string) {
    const json = JSON.parse(data)
  
  
    const log = (type: string) =&gt; console.log.bind(console, type);
  
    return &lt;div&gt;
        {json &amp;&amp;
            &lt;Form schema={json}
                  onChange={e =&gt; {                    
                      setAdditionalData(e.schema.properties) // something like this
  
                  }}
                  children={true} // hide submit button
                  onError={log(&quot;errors&quot;)}/&gt;
        }
    &lt;/div&gt;
  
  }
  </code></pre>
  <p>But I cannot get the update field values from event. Can someone help me with this.</p>