F2 4.x Guide模块是否可以支持自定义 html

- [ ] I have searched the [issues](https://github.com/antvis/f2/issues) of this repository and believe that this is not a duplicate.

### What problem does this feature solve?
F2 4.x Guide 可以支持自定义 html 内容

### What does the proposed API look like?
功能类似3.x的 chart.guide().html()

Start by locating the F2 4.x Guide implementation and comparing it with the 3.x chart.guide().html() API referenced in the issue. Define the 4.x API and verify that custom HTML content can be rendered through a guide; the issue does not name specific files or tests.

Written by the indexing model from the issue text.