title: How to customize Echart series label text?
body: <p>I need to show custom Series label instead of data array value. here my series data array is</p>
  
  <pre><code>data: [820, 932, 901, 934, 1290, 1330, 1320],
  </code></pre>
  
  <p>When i enable label : </p>
  
  <pre><code>label: {
      show: true,
      position: 'top',
      color: "black",
      fontSize:12,
  },
  </code></pre>
  
  <p>It show data array value top of my line chart i need to show custom text instead of this data array values <br><strong>[text1,text2,text3...]</strong></p>
  
  <p>My source code:</p>
  
  <pre><code>option = {
  xAxis: {
      type: 'category',
      data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
  },
  yAxis: {
      type: 'value'
  },
  series: [{
      data: [820, 932, 901, 934, 1290, 1330, 1320],
      type: 'line',
      symbolSize: 12,
      label: {
          show: true,
          position: 'top',
          color: "black",
          fontSize:12,
      },
    }]
  };
  </code></pre>