Add www support to custom domains with redirect possibility

When setting a custom domain for Help Center or the Portal (Feedback, Changelog, Roadmap) - support for adding a www. with a redirect option would be appreciated.

i.e.

When setting a custom Help Center domain as help.example.com

Option to add the www.help.example.com with redirect possibility, so it would create an SSL for both domains and allow redirecting from

www.help.example.com → help.example.com