Quick Answer
Chocolate Chips does not use the same grams-to-cups value as every other ingredient. Using a practical US cup reference, 170 grams of chocolate chips is about 1 cup.
That means 100 grams of chocolate chips is about 0.59 cups, while 200 grams is about 1.18 cups.
Chocolate chips pack moderately into a cup. One US cup of standard chocolate chips weighs about 170 grams.