You’re asking about the wrong tool. Virtualmin is for managing websites, and of course it handles managing VirtualHosts (or the equivalent in nginx).
Webmin does have a GUI for Apache, but that’s almost certainly not what you’re looking for. If you don’t already know how to do it, Webmin is the wrong tool for the job (and even if you do, it’s probably still the wrong tool for the job). Webmin is a general purpose system administration tool. Virtualmin is for web hosting.