[Question] Is it possible to remote search for a package within `requirements` method?

Hello,

Would it be possible to call somehow remote search for a package from the `requirements` override method?

I need a way to do the following:
- for a requires `mylib`, defined as requirements `mylib/[^0.1.0]@conan/stable`
- I need to check if it exists on a specific other user/channel (ex: `mylib/0.1.1@testing/my-test`) on the remotes or locally, if it does, take it, if it does not use the `@conan/stable`

Would it be possible easilly in my `conanfile.py`?