[Feature] markline不能指定zlevel，导致markline的文字被图表挡住
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new-feature
topic: marker
- Dominant language
- TypeScript
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- Avg merge
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Description
### Version
5.2.2
### Link to Minimal Reproduction
_No response_
### Steps to Reproduce
添加了markline之后，由于markline文字较长，就会触发
### Current Behavior
markline的文字被图表挡住
### Expected Behavior
markline可以指定zlevel，避免markline的文字被图表挡住
### Environment
```markdown
- OS:
- Browser:
- Framework:
```
### Any additional comments?
_No response_
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