Golang：我可以投到chan界面{}(Golang: Can I cast to chan interface{})

I am trying to write a general purpose wrapper for subscriptions, something like:

type Subscriber interface{
    Subscribe(addr string) chan interface{}
}

chan library.Object

func (s *mySubscriber) Subscribe(addr string) chan interface{}{
    ch := make(chan library.Object)
    library.Subscribe(addr, ch)
    return chan interface{}(ch)
}

Currently, I don't believe such a cast is possible. And I don't want to modify the underlying library, since the wrapper should be agnostic to library implementations.

I've seen Is there a way to cast Structs for sending over a channel, but in that case the application can be modified to suit the need. Here, it can't. Is this possible? Is there a better way?

chan library.Object