title: How to put a heatmap in ngx-leaflet?
body: <p>I would like to put a heatmap over a ngx-leaflet map (using angular), like in the following image.</p>
  
  <p>How can I achieve that?</p>
  
  <p><img src="https://i.stack.imgur.com/kbMwI.png" /></p>
  
  <p>Here is the <a href="http://leaflet.github.io/Leaflet.heat/demo" rel="nofollow noreferrer">demo</a> of the example.</p>