[Feature] 如何设置热力图的markline在x轴刻度左侧而不是两个刻度之间（即markline可偏移）

[OuZeWei]

What problem does this feature solve?

解决自定义markline偏移问题

What does the proposed API look like?

heatmap->markLine

[echarts-bot[bot]]

@OuZeWei 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

**TITLE** [Feature] How to set the markline of a heat map to the left of the x-axis scale instead of between two scales (i.e. the markline can be offset) **BODY** ### What problem does this feature solve? Resolve custom markline offset issues ### What does the proposed API look like? heatmap->markLine

[Ovilia]

https://echarts.apache.org/en/option.html#series-line.markLine.label.position 这个可以解决吗

[github-actions[bot]]

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