🤔 [QUESTION]图例legend的marker和文本有没有可控制居中对齐的？marker和文本底对齐不好看呐~

### 🐛 图例legend的marker和文本有没有可控制居中对齐的？marker和文本底对齐不好看呐~

### 💻 Link to minimal reproduction

我看了marker和label的所有配置项，style的样式配置里，都没有offsetX、offsetY属性，legend.label.style.textBaseline配置middle也无效，这个细节问题有没有其他办法解决？自定义配置marker也还是不能对齐，自己写HTML的图例，又没有交互了~，这个问题有解决了的没~

### 🏞 Expected result

### 🚑 Any additional [like screenshots]

* **G2Plot Version**:
* **Platform**:

No file, test, G2Plot version, or platform is named. Start by reproducing the legend marker and label alignment with the reported configuration options, including textBaseline and custom markers. Done means identifying a supported way to center them while preserving legend interaction, or documenting that it is not supported.

Written by the indexing model from the issue text.