Self-reported? I cann't find any transcript template in Chicago website. Shall I use the one I got from any MBA institute? But, it seems strange and a little impolite.
It is a weakness, but it's not gonna be a disaster that will surely kill your application.
Application decision is based upon many factors, which are subtly inter-related and mutually complementary to some extent.
For instance, if your GPA is bad, but your GMAT and TOEFL is very strong, and you also had lots of extra activities, your low GPA is explainable to the school.
Don't let your hope be squezzed off, concentrate on your essays, that's the core.