useForm中的rules中某一个required为computed的时候，验证规则会生效，但是form-item的label前面的*号不会显示或隐藏

[JobinJia]

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

Version

3.0.0-alpha.4

Environment

mac Os catalina 10.15.4/ chrome 84.0.4147.125 (正式版本) （64 位）/ vue 3.2.20

Reproduction link

Steps to reproduce

Demo中
当表单中 Activity name 的值不为 'a' 时，Activity zone 为必填， 否则，Activity zone为非必填

What is expected?

form-item 的label前的必填符号(*) 应该正确的显示或隐藏

What is actually happening?

form-item 的label前的必填符号(*) 没有正确的显示或隐藏

[JobinJia]

20211024_042228.mp4

20211024_042331.mp4

fork 代码改了一份，能实现其效果。但只支持required 是ref的情况。如果rules其它字段也要支持ref ，改动量略微有些大。
这个功能是否需要？如果需要我可以偿试修改并提个PR

[github-actions]

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