title: How to color ggforce::geom_mark_ellipse labels with fill color
body: <p>Is it currently possible to make the <em>labels</em> generated with <code>ggforce::geom_mark_ellipse(label=)</code> colored?</p>
  
  <p>In the example below, I'd like to see <em>versicolor</em> typeface in green:</p>
  
  <p><img src="https://i.stack.imgur.com/fybGu.png" alt=""></p>