Allow user to access panel via their own domain

Right now when the user accesses the panel via their own domain, eg https://user-domain.com:8083 they are presented with a TLS error because the certificate served will be for the hostname of the hestia server. The only way to properly access it is https://hostname.com:8083

What is the best way to fix this issue? Can I get hestia-nginx to serve the correct ssl certificate for the users domain, or should I create some kind of reverse proxy?

Currently not possible