this covers some ground on how to do that in hestia: NGINX Reverse proxy for Docker app - #3 by flawlessx92
add the domain as normal web-domain. create a specific template which holds more or less only the proxy_pass directive to the port of your app in the location block and select that for the domain in the control panel
additional important about the web templates work you’ll find here: Web domains and SSL Certicates — Hestia Control Panel documentation