How to make rounded corner bars in google charts
<blockquote>
  <p>I have following chart with square bars</p>
</blockquote>

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

<blockquote>
  <p>I want it to make rounded corner bars with google charts like below pic</p>
</blockquote>

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