[Feature] xAxis. axisPointer.label 缺少 position 属性

[pueri1e]

What problem does this feature solve?

移动端使用时，文本标签显示在下方被手指遮挡 https://echarts.apache.org/examples/zh/editor.html?c=doc-example%2Fcandlestick-axisPointer&edit=1&reset=1

What does the proposed API look like?

希望添加定位属性，调整到上方

[echarts-bot[bot]]

@pueri1e It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people and get helped, we'd like to suggest using English next time. 🤗

TRANSLATED

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[Feature] xAxis.axisPointer.label is missing the position attribute