4.x版本图例怎么配置默认置灰和高亮呢

[duud666]

• [ ] I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

比如5个图例，前2个默认置灰不选，后3个高亮，看3.x版本好像有checked。4.x就无了例外官网文档不全

What does the proposed API look like?

类似a,b为高亮状态，不配为置灰

[duud666]

如果可配置的话，和图能联动么？