title: How can I add 'on', 'off' label to mat-slide-toggle?
body: <p>Right now, I have a slide-toggle like this:</p>
  
  <pre><code>&lt;mat-slide-toggle
      class="toggle"&gt;
  &lt;/mat-slide-toggle&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ZCDfR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZCDfR.png" alt="enter image description here"></a></p>
  
  <p>How can I add <code>on</code>, <code>off</code> label like below?</p>
  
  <p><a href="https://i.stack.imgur.com/drxFT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/drxFT.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/tprj7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tprj7.png" alt="enter image description here"></a></p>