title: How to convert _JsonMap to Map in flutter
body: <p>I have response body with type _JsonMap</p>
  <p><a href="https://i.stack.imgur.com/ZP5j9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZP5j9.png" alt="enter image description here" /></a></p>
  <p>How I can convert it into standard Json? I cannot find way to extract map with my data from this object</p>