MailChimp

How do we edit what type of personal data is collected by MailChimp? Currently it is defaulted only for email address, but MailChimp allows you to add any custom fields so potentially it is collecting more than just the email address. So this is totally misleading if we are publishing a policy stating we use MailChimp and the only personal data it is collecting is the email address. We need the same mechanism as used for the contact form, i.e. we can select from a list of presets various types of personal data that is collected by MailChimp. Please fix this.