Usermin behind reverse proxy and multidomain

I followed FAQs | Webmin and was able to set up usermin behind a reverse proxy with one domain (webmail.domain.com)
Is it possible to do this with multiple domains? For example all webmail.* subdomains?

SYSTEM INFORMATION
OS type and version Debian 12
Webmin version 2.111.
Usermin version 2.010.