tooltip 是否支持自定义 marker？是否直接使用 legend 中的 itemMarker ？

### 问题描述

需要实现如下的效果

### 重现链接

_No response_

### 重现步骤

_No response_

### 预期行为

_No response_

### 平台

- 操作系统: [macOS, Windows, Linux, React Native ...]
- 网页浏览器: [Google Chrome, Safari, Firefox]

### 屏幕截图或视频（可选）

_No response_

### 补充说明（可选）

_No response_

Start by inspecting the tooltip and legend implementations to determine how markers are currently configured and whether legend itemMarker is available to tooltip rendering. Confirm the intended custom-marker behavior from the attached example and establish tests covering the resulting tooltip marker before considering the issue complete.

Written by the indexing model from the issue text.