Custom request with i18next-http-backend

Question

I am likely missing some simple solution, but I would like to know how one would send a custom request using i18next-http-backend with a url that cannot be defined by the loadPath option. I had though it would be easily done via the request function, but the issue there is that the namespaces and locales being requested are not part of the arguments list. As a result the only option I had come up with is JSON encoding them in a loadPath function to then decode them in the request function, but that feels unnecessarily convoluted.