See title ^^
I don't think that's possible right now, since Profile2 attaches different/separate entity forms to the user registration form under the hood.
What we could investigate is whether adding generic support for Profile2 forms would make this possible — although I doubt that, since Profile2's way of integrating with the user registration form is very special and custom...
This issue has no child issues.
Drupal is a registered trademark of Dries Buytaert.