Basepath for a backend

Hi,

is it possible to configure a base path for a given backend.

Here's the use case:

If a user requests: assets.mydomain.com/food/apple.jpg
the file from the backend  under   file-backend.mydomain.com/production/bucketABC/food/apple.jpg should be served

I'd consider /production/bucketABC/ to be the base path of the backend.

The base path should not be exposed to the user.

Thanks!