How to show numbers at the middle of bars in morris?

Dear All,
I’m using bar chart by morris, I want to show dynamic numbers at the middle of bars, but I don’t know how to do it?
Here is my codes:

  $chart_data = '';

 while ($row = mysqli_fetch_array($result) and $row2 = mysqli_fetch_array($result2) ) {
$chart_data .= "{ PRODUCT_LINE:'".$row["PRODUCT_LINE"]."', 
    total_time:".$row["total_time"].", actual_total_time:".$row2["actual_total_time"].", }, ";
        $chart_data = substr($chart_data, 0, -2);


and here is my script

   new Morris.Bar({
    // ID of the element in which to draw the chart.
   element: 'chart',
  // Chart data records -- each entry in this array corresponds to a point on
  // the chart.
  data:[<?php echo $chart_data; ?>],
 // The name of the data record attribute that contains x-values.
 xkey: 'PRODUCT_LINE',
 // A list of names of data record attributes that contain y-values.
 ykeys: ['total_time', 'actual_total_time'],
 // Labels for the ykeys -- will be displayed when you hover over the
 // chart.
labels: ['plan', 'actual'],
hideHover: 'auto',
postUnits: '',
xLabels: '',
gridTextColor: 'yellow',
gridTextSize: '12',
 gridTextFamily: 'iSans',

does anyone know?

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