Quick Answer
Rice (raw) does not use the same grams-to-cups value as every other ingredient. Using a practical US cup reference, 187 grams of rice (raw) is about 1 cup.
That means 100 grams of rice (raw) is about 0.54 cups, while 200 grams is about 1.07 cups.
Rice shape and variety can shift cup results a little, so these values work best as practical kitchen references.