The profile image is the full sized image already. It's scaled as needed to fit the space, but you can use CB Auto Actions and a code action on the after profile display trigger to add a lightbox if you want or use a 3rd party lightbox content plugin combined with the Layouts feature of the avatar to have a lightbox open on click.
It's unlikely something like this would be implemented into the core though; especially as our field classes are still legacy and we've plans to completely rewrite them we are avoiding adding new features to them as much as possible.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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