title: Google Graph API Custom Tooltip Bolding
body: <p>I am trying to replicate the default tooltip styling used by the Google Graph API:</p>
  
  <p><img src="https://i.stack.imgur.com/AnIh1.png" alt="Default Tooltip"></p>
  
  <p>In particular the bolding of some of the text as seen above. As soon as I add my own tooltip I can no longer bold parts of the text as in the default view. </p>
  
  <p>The label <code>tooltip.textStyle</code> only offers one the option of changing the colour for the entire text displayed <code>{color: &lt;string&gt;, fontName: &lt;string&gt;, fontSize: &lt;number&gt;}</code>. </p>
  
  <p>Any ideas?</p>