Get subscribers from extra profile field

Hello,
I’ve created some additional profile fields, with the following code (actually there are other fields, aside ’email2′):

function modify_contact_methods($profile_fields) {
	$profile_fields['email2'] = 'email';
	return $profile_fields;
}

Is it possible to add email addresses from these extra fields as subscribers? Maybe with the meta key / value? Would it only be achievable by coders?
Thanks

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