Usually, it is used for the AdGuard Home service using. So, if you have a to use another DNS server network, adguuard AdGuard Home is range, you can do it Home settings.
From a device on your local network, try accessing your web application using the subdomain, e. I know its stated in the bigger table but not sure if splitting it from the free plain text servers would be useful. This setup assumes you already have a reverse proxy in place and you are able to access the app remotely from app1.
