NGINX manager SSL pass-through

I am running HASSIO with NGINX manager. I have a 2nd PI running a camera that I would like to communicate with HASSIO using HTTPS. I am trying to work out how to get a certificate to the 2nd PI. I assume I need to pass is through the NGINX as port 443 is forwarded to HASSIO. If anybody could point me in the right direction it would be much appreciated.