title: In ngx-Charts, How to make tooltips always appear? Instead of appear on mouse-over and then disappear?
body: <p>I am trying to build the stacked bar graph using ngx-charts in angular 4.x. While displaying the data labels, I am using tooltip template and able to display, but I want those labels to show up always (instead on only on mouse-over).</p>
  
  <p>How I can achieve this in ngx-charts?</p>
  
  <p><a href="https://i.stack.imgur.com/I5kwp.png" rel="noreferrer"><img src="https://i.stack.imgur.com/I5kwp.png" alt="Sample Stacked Bar Chart"></a></p>