🐛 [BUG]

### 🐛 Bug description [Please make everyone to understand it]
https://g2plot.antv.antgroup.com/examples/case/statistical-scenario/#funnel-analysis

内置G的addShape希望能够增加'dom'类型，以便于用户扩展。

### 📷 Step to reproduce
官网案例进行操作
### 🏞 Expected result

### 🚑 Any additional [like screenshots]

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

Start by reproducing the behavior in the linked funnel-analysis example and tracing the built-in G addShape path used there. Confirm how the requested dom shape type should support the reported extension scenario, then verify the example's expected result without regressions.

Written by the indexing model from the issue text.