你可以使用 api.value 获取某个维度的数据，或者如果你数据是放在自定义的属性里的话，可以把数据放到一个数组外面然后根据 dataIndex 去索引，比如
```js
var customData = [....]
option = {
series: [{
renderItem(params) {
var data = customData[params.dataIndex];
}
}]
}
```
[ Full content available at:
https://github.com/apache/incubator-echarts/issues/9076 ]
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