Allow user to access panel via their own domain

Right now when the user accesses the panel via their own domain, eg 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

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