Possible to use ssl_preread?

[iknowtech]

It looks like maybe this module is installed, but I'm not sure how I would utilize it correctly with NPM. I have an existing NGINX server that I setup on CentOS almost 5 years ago, and its been ticking along since with an occasional hiccup related to LetsEcrypt Certs not updating correctly. Well this recently broke again, and I really want to decommission this old server and setup NGINX Proxy Manager in Docker in its place. Currently this setup isn't using Docker and upgrades a huge pain as NGINX needs to be recompiled from source each time to get all the needed modules, so its basically never updated and become a thorn in my side.

I have almost everything migrated over from this old server to a brand new NPM container running in Ubuntu Server 20.04 LTS in Azure. I have a couple of Applications that I'm Proxying that use Stream including a Connectwise Control (ScreenConnect) server that has its Relay traffic going over Port 443. This is a Proprietary TCP Protocol, and how I accomplished this before was with this bit in the Stream Block

map $ssl_preread_protocol $upstream {
        ""          10.0.70.4:443;
        "TLSv1.3"   10.0.50.7:443;
        "TLSv1.2"   10.0.50.7:443;
   }

   server {
        listen 10.0.50.6:443;
        proxy_pass $upstream;
        ssl_preread on;
    }

10.0.70.4 is the Connectwise Control Server

10.0.60.7 is 2nd NIC on the NPM Server

10.0.50.6 is Primary NIC on the NPM Server

I tried adding this to a Custom File in /data/nginx/custom/stream.conf

I'm not entirely clear on if all the required NGINX Modules are installed for this to work, and how the Custom file should be formatted, and if this is the correct custom file to put the code into. I'm also not entirely clear on if the Network inside the Docker container will work correctly with double Proxy from the two Internal NICs.

I'm certain I'm doing something wrong as putting this into the custom stream.conf causes the NGINX to crash.

Bear with me, as I'm pretty much a Noob with NGINX and Docker in general.