How to reference types in other crates inside library!?

[arthrarnld]

I'm trying to write a library! declaration along these lines:

reflect::library!{
    extern crate anyhow {
        type Result;
    }

    extern crate my_crate {
        trait MyTrait {
            fn trait_fn(&self) -> anyhow::Result;
        }
    }
}

But the macro doesn't seem to support the anyhow::Result path. Since the README mentions "There may be additional extern crate blocks here if we need to use types from outside the standard library", I'm wondering if I'm missing something or if this is not supported yet. Thanks!