tooltip的trigger为item时，是否能够支持“数据吸附”功能？
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difficulty: normal
enhancement
priority: high
- Dominant language
- TypeScript
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Description
### One-line summary [问题简述]
tooltip的trigger为item时，是否能够支持“数据吸附”功能？
若暂不支持的话，是否有计划实现？
类似于这样的效果：https://www.highcharts.com/demo/line-basic/dark-unica
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