Multiple email fields in a wpcf7 form

Is it possible to add multiple email fields to a (ContactForm7) form and indicate which email address should be subscribed to MailChimp?

Case:
I have a form in which you can add (in this order):
1. friend’s details (including email)
2. your details (including email)
When submitting the form the latter email address should be added to my MailChimp list. Unfortunately the former is used by mc4wp to pass along to MailChimp.

How should I indicate the latter email address is the address that should be sent to MailChimp?

Example:

<label> Friend Email
    [email* friend-email] </label> <!-- should be sent to me via email -->
<label> Your Email
    [email* EMAIL] </label> <!-- should be subscribed to MailChimp -->

When submitted, the friend-email is subscribed to MailChimp.