robertjorg opened a new issue #10708: Ability to add additional data to tooltip 
formatter
URL: https://github.com/apache/incubator-echarts/issues/10708
 
 
   ### What problem does this feature solve?
   You can put data in the tooltip formatter for the given data point. On the 
line graph you seem to only be able to use the name and value like this:
   
   ```    formatter: function (params) { return params.value   '<br />'   '('   
params.name   ')' }```
   
   It would be nice to have the ability to use data that are not present in the 
param to display in the tool tip. An example is when the line graph shows the 
percentage of a numerator and denominator. The tool tip could show the percent, 
numerator, and denominator (the numerator and denominator come from another 
array of data)
   
   ### What does the proposed API look like?
   ```   tooltip: {
    formatter: function (params) { return params.value   '<br />'   '('   
params.name   ')'   '<br />'   'Numerator: '   this.data.numerator   '<br />'   
'Denominator: '   this.data.numerator }
   }```
   
   <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
   <!-- This issue is in English. DO NOT REMOVE -->

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