[visualization-api] How to Add Point on Visualization: Area Chart

[jp serrano]

<https://lh3.googleusercontent.com/-_ugW3D4yOMY/WeDJJPxODHI/AAAAAAAAAQg/LKfk0YbsQGgj6UVbp90ZOnbEHBQ1cU5jQCLcBGAs/s1600/areachart.PNG>

How to add a point inside the Google Charts Visualization: Area chart like 
the red point in the picture shown above and can i put some label above or 
beside the point?

Here is the code that outputs the chart above

  google.charts.load('current', {'packages':['corechart']});
  google.charts.setOnLoadCallback(drawChart);

  function drawChart() {
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'Output1');
    data.addColumn('number', 'Height');
    data.addColumn({type:'string', role:'annotation'});
    data.addRows([
      <?php echo"['',  2, null],"; ?>
      <?php echo"['',  2, '1 Kpa ---------->'],"; ?>
      <?php echo"['2',   1, '<---------- 2'],"; ?>
      <?php echo"['3 σ',   0, '<---------- 3 σ']"; ?>
    ]);

    var options = {
      title: 'Total Stress',
      hAxis: {title: '<-------- Direction',  titleTextStyle: {color: '#333'}},
      vAxis: { ticks: [{v:2, f:'1 Kpa ->'}, {v:1, f:'1 m'},{v:0, f:'length ^ 1 
m'},{v:0, f:'1 m'}] }
    };

    var chart = new 
google.visualization.AreaChart(document.getElementById('total_stress'));
    chart.draw(data, options);
  }

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