Unfortunately there is no set of diagrams that shows you the Freddie Green chords specifically within iReal Pro.
You might find this book useful along with the one you have:
http://www.halleonard.com/product/vi...r&subsiteid=1&
It does not take long to learn some of the simple shapes, then you can input some of the exercises you are learning into iReal Pro to provide a backing for you to practice with. I think you will find it fun if you have not done this already.
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