HxinY499 opened a new issue, #19718:
URL: https://github.com/apache/echarts/issues/19718
### What problem does this feature solve?
-
我尝试将theme和dataset这两个特性结合使用，dataset里定义规定好的属性，在主题的某些组件的formatter使用，达到样式个性化又方便扩展的目的，这个方式在tooltip里奏效了，它的formatter可以接受到了dataset相关的属性，但是legend.formatter接收的参数只有name，无法扩展。
### What does the proposed API look like?
```javascript
{
legend: {
formatter: (params) => params.data.xxx
}
}
```
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