[GitHub] [incubator-echarts] weixianpin opened issue #9039: The Legend formatter prop how to customize style

[GitHub]

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### One-line summary [问题简述]
The Legend formatter prop how to customize style？like this:
![image](https://user-images.githubusercontent.com/16029151/45264635-3dbf0380-b472-11e8-9f22-10ac0561c353.png)
let the text（%） align right, or let formatter recognize html tag like 
[#5212](https://github.com/apache/incubator-echarts/issues/5212)(closed but not 
solved) 
 said? 




### Version & Environment [版本及环境]
+ ECharts version [ECharts 版本]:4.1.0
+ Browser version [浏览器类型和版本]:google chrome  68.0.3440.106（正式版本） （64 位）
+ OS Version [操作系统类型和版本]:Windows 10





### Expected behaviour [期望结果]





### ECharts option [ECharts配置项]
<!-- Copy and paste your 'echarts option' here. -->
<!-- [下方贴你的option，注意不要删掉下方 ```javascript 和 尾部的 ``` 字样。最好是我们能够直接运行的 
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```javascript
option = {

}

```




### Other comments [其他信息]
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[ Full content available at: 
https://github.com/apache/incubator-echarts/issues/9039 ]
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