Not able to proxy ubooquity through nginx-proxy-manager

I’m using jc21/nginx-proxy-manager as a reverse-proxy with SSL support as frontend for all my docker container. This works fine for all containers except when attempting to create a cert for ubooquity it throws an “internal error”. After a little digging around I found this to be because nginx-proxy-manager requires the “root” of the container to contain the cert data. This is not available for ubooquity because there are only the defined subdirectories available (normally /config /books /comics /files). Any ideas how I can get this to work?