title: how to add formatter tooltip in echart for multiple values for pie diagram
body: <p>I am using echart pie diagram but I want to show multiple records in tooltip.</p>
  
  <pre><code>option = {
      tooltip: {
          trigger: 'item',
          formatter: '{a} &lt;br/&gt;{b} : {c} ({d}%), &lt;br/&gt;{name1} : {value1} '
      },
      legend: {
          orient: 'vertical',
          left: 'left',
          data: ['aa', 'bb', 'cc', 'dd', 'ee']
      },
      series: [
          {
              name: 'text name',
              type: 'pie',
              radius: '55%',
              center: ['50%', '60%'],
              data: [
                  {value: 335, name: 'aa',value1: 335, name1: 'xx'},
                  {value: 310, name: 'bb',value1: 335, name1: 'yy'},
                  {value: 234, name: 'cc',value1: 335, name1: 'zz'},
                  {value: 135, name: 'dd',value1: 335, name1: 'ww'},
                  {value: 1548, name: 'ee',value1: 335, name1: 'vv'}
              ],
          }
      ]
  };
  </code></pre>
  
  <p>I have tried with this formatter: '{a} <br/>{b} : {c} ({d}%), <br/>{e} : {f} ({g}%)' and
  '&lt;%=name%>:&lt;%= value %>&lt;%\n%>&lt;%=name1%>:&lt;%= value1%>&lt;%\n%>&lt;%=name2%>:&lt;%= value2 %>' this
   link :<a href="https://echarts.apache.org/examples/en/editor.html?c=pie-simple" rel="noreferrer">https://echarts.apache.org/examples/en/editor.html?c=pie-simple</a></p>
  
  <p><a href="https://i.stack.imgur.com/I9Sij.png" rel="noreferrer"><img src="https://i.stack.imgur.com/I9Sij.png" alt="enter image description here"></a></p>