Add UWSGI protocol support

[calum-renewabledynamics]

Describe the solution you'd like
I would like to request some way to pass UWSGI packets.

Describe alternatives you've considered
Normal NGINX is able to do this easily.
But I can't see any way to do it with NPM (even using advanced configuration).

Additional context
On normal NGINX, if I want to add a UWSGI proxy host (e.g. a flask app), I just have to add:
include uwsgi_params; uwsgi_pass 127.0.0.1:1234;