SSl support for alias domains (multisite setup WordPress)

When will the Feature for alias domains will be coming out? Ref .

@mrrobot47 you once told me It will take care of SSL for all domains. Simply adding a new alias domain will re-create the main SSL certificate of the site with that domain/subdomain appended.

Can you give us any update about that feature?
Otherwise I we can not use ee in a multisite setup :pensive:
Or: is there a command to install a own cert for that single subdom?