separate servings from nutritional information per xx and trace amounts

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I've noticed a lot of people tend to put in the serving size as whatever is stated as the nutritional information per weight i.e. 100 grams when a serving is 25 grams so having a separate serving size from what the nutritional informations is stated in i.e. per 100 gram would be useful i.e. being able to input the nutritional information in as stated (usually for me per 100 gram) and then being able to state what the recommended serving size is.

Also being able to state in the nutritional information that something is a trace amount would be useful