remark function in proxy hosts list

[spysir]

The remark function is very useful to distinguish different services

[jamebal]

I really need this feature.

[Songxwn]

strongly support

[GodD6366]

I submitted a PR, Hope it can be adopted. #4005

[github-actions]

Issue is now considered stale. If you want to keep it open, please comment 👍