Google Charts - How to append text to default tooltip
<p>I want to add a custom tooltip to my charts by using the default one and for example just append some text to it.</p>

<p>Is this even possible, or to i have to create it all by myself with html?</p>

<pre><code>data= google.visualization.arrayToDataTable([
        ["Element", "Duration ", { role: "style" }, { role: 'tooltip' }],
        ["Count", 23515, "orange", ???],
      ]);   
</code></pre>

<p><strong>How it is (Default Tooltip):</strong></p>

<p><a href="https://i.stack.imgur.com/CMvUW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CMvUW.png" alt="enter image description here"></a></p>

<p><strong>How i want it:</strong></p>

<p>Append the duration as readable time, but still keep the default tooltip</p>

<p><a href="https://i.stack.imgur.com/FXure.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FXure.png" alt="enter image description here"></a></p>