How to encrypt traffic in Jupyterhub (TLJH) with AWS Certificate Manager

Question

I'm trying to run Jupyterhub (TLJH) in AWS EC2 using the steps provided here. The setup works over http. However, I run into trouble when I try to map a subdomain and simultaneously use a SSL certificate and key from AWS Certificate Manager.

The steps outlined in this link describes how to encrypt if we use lets encrypt, or if we can download the SSL key and certificate. Unfortunately, its not simple to download the SSL certificate from AWS Certificate Manager.

So, my question is, how to use the AWS Certificate Manager that has certificate for a subdomain to encrypt traffic and connect to the jupyterhub.