Official comment
Thanks for your feature request!
Ontraport Campaigns provide a comparable method, using a "Notify Someone with an Email" element after the regular "Send Email" element. Name the same email message in the "Notify" element and when the contact lands on it, the email is configured with the contact's information and sent to the email address you have specified.
We don't currently have plans to add a BCC field to emails, but will keep this feature request open to see if there's additional interest!