[visualization-api] Annotation text Alignment for NEGATIVE values?

[Андрей Малютин]

Please, someone help me))
How could i place the *annotation text* to the bottom of the bar, if the 
value is *negative*?

*Exemple:* https://jsfiddle.net/1ehqfkv9/

*Code:*
<script type="text/javascript" 
src="https://www.gstatic.com/charts/loader.js";></script>
       <div id="columnchart_values" style="width: 500px; height: 
300px;"></div>
<script type="text/javascript">
    google.charts.load("current", {packages:['corechart']});
    google.charts.setOnLoadCallback(drawChart);
    function drawChart() {
      var data = google.visualization.arrayToDataTable([
        ["Element", "Density", { role: "style" } ],
        ["Copper", 8.94, "#b87333"],
        ["Silver", -10.49, "silver"],
        ["Gold", 19.30, "gold"],
        ["Platinum", 21.45, "color: #e5e4e2"]
      ]);

      var view = new google.visualization.DataView(data);
      view.setColumns([0, 1,
                       { calc: "stringify",
                         sourceColumn: 1,
                         type: "string",
                         role: "annotation" },
                       2]);

      var options = {
        title: "Density of Precious Metals, in g/cm^3",
        width: 600,
        height: 400,
        bar: {groupWidth: "95%"},
        legend: { position: "none" },
        
      };
      var chart = new 
google.visualization.ColumnChart(document.getElementById("columnchart_values"));
      chart.draw(view, options);
  }
</script>

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