Just posted a similar question in a new thread. It looks like no one knows how to add accurate data for grains that aren't currently listed
Apparently in the desktop version you can download files created by the major grain distributors and it will import the data into the program. I think the files look similar to this one of the Briess products but have no idea how to import into mobile.
https://github.com/djmitche/beersmith/blob/master/Updates/Briess.bsmx