title: Adding column value labels to R googleVis gvisColumnChart?
body: <p>Does anybody know how to add column value labels to a gvisColumnChart()?</p>
  
  <p>There are so many options to go through, and I'm sure I'm not the first with this question. It would be really helpful for my project...</p>
  
  <p>Edit: By value labels I mean something like this (numbers written on the bars themselves):  </p>
  
  <p><img src="https://i.stack.imgur.com/K7kQc.png" alt="Chart with bar value labels"></p>
  
  <p>I'm using R 3.2.0 and googleVis 0.5.8</p>
  
  <p>The answer for JS is here:
  <a href="https://developers.google.com/chart/interactive/docs/gallery/columnchart" rel="nofollow noreferrer">https://developers.google.com/chart/interactive/docs/gallery/columnchart</a></p>
  
  <p>Essentially creating a secondary <code>view</code> element and adding it to the plot:</p>
  
  <pre><code>  var view = new google.visualization.DataView(data);
    view.setColumns([0, 1,
                     { calc: "stringify",
                       sourceColumn: 1,
                       type: "string",
                       role: "annotation" },
                     2]);
  
    var options = {...};
    var chart = new google.visualization.ColumnChart(document.getElementById("columnchart_values"));
    chart.draw(view, options);
  </code></pre>
  
  <p>I just don't quite know how to pass this extra element via R. Help?</p>