Can we pass tornado Requesthandler header to jupyterlab

Hello,

I was trying to check on whether we can pass the tornado requesthandler header to jupyterlab. As I trying to set up a proxy before the jupyterlab, and was sending some custom headers, I could get in a tornado application, and would like to do the same in the jupyter server side too, is it possible or do i need to use extensions? attempt is to gather:

X-Forwarded-User and X-Forwarded-Email