https://caddy.community/t/guide-for-windows-admin-center-proxy-from-linux-vm-to-server-core/7192/8
Install latest caddy binary, at this time, I mean latest! (this is "bleeding edge", see above link) IMO, but should be mainstream soon enough.
Example Simple Caddyfile:
cat << 'EOF' >/var/www/html/wac/Caddyfile
https://cadtest.domain.com {
tls /etc/ssl/certs/domain.crt /etc/ssl/private/domain.key
reverse_proxy 192.168.1.42:443 {
transport http_ntlm
}
}
EOF
cd /var/www/html/wac/
caddy run