How to add a rel=author metatag for profile2?

Hi there,
After configuring this module, I´ve realised that there seems to be no way to configure the authorship of the profile2 of each user.
In fact, it is assigned by the Global Metatag authorship, so, all profiles have the global author assigned.

How may I prevent that to happen? The profile2 have a text field to put in there the G+ link, so how may I use that link with Profile2?

Note: I´ve set the priority of this to critical, because of a video that I´ve watched a while ago, at the GoogleWebmastersHelp channel (I can´t seem to find it now though), where it basically says that your articles should have a rel=author metatag, and should link to your bio (profile2), and that bio should have a rel=me tag in order to point it to the author´s google+ profile. So, if we can´t actually do that, maybe it´s somewhat SEO critical?

Thanks!!