Wheat and Flour Testing Methods - A Guide to Understanding Wheat and Flour Quality; Wheat Marketing Center Inc, 2004

Here it’s nutrition information by the gram, serving size by the gram, packaging by the millilitre.
The only way you can compare the relative value of different ice creams is by using the serving size and # servings info from the nutrition panel to calculate the grams per package. (Or even better, comparing g/fat per package because that’s where the value is).