Not sure, why you want to set the parameter. Certificates are bound to a 'common name', which is usually a fully qualified domain name. Using different domain names won't work with a certificate issued for a single name. The solution is to use a multi-domain certificate [1], where one can use as well IP-addresses in the subject alternative fields [2].
When the same server receives requests under multiple names, these should be listed in the section ns/module/nssock/servers of the NaviServer config file (see also [3]).
[1] https://www.digicert.com/subject-alternative-name.htm
[2] https://cabforum.org/guidance-ip-addresses-certificates/
[3] https://naviserver.sourceforge.io/n/nssock/files/nssock.html
