title: Apache eCharts - custom dot within existing chart
body: <p>I want to display a single marker (the DOT on the image below) over an existing chart somewhere. The chart is made with Apache Echarts and in my case it is a stacked Barchart - but I guess that might not even matter for rendering the dot.</p>
  <p>Can this dot be done with a custom chart in Apache Echarts somehow? I've checked all the examples and couldn't find anything similar.</p>
  <p><a href="https://i.stack.imgur.com/Gr3H3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Gr3H3.png" alt="barcharat with custom dot" /></a></p>