There are certain types of health data that I want to track but there are no pre-made categories for them in the "All" categories list. Is there any way to add new categories? For example, I want to add an "energy" category to track how energetic I feel each day, that way I can see which other aspects of my health affect my percieved energy level. For instance if I get an hour extra of sleep does that make me feel much more energetic? How little sleep can I get over the course of a week without lowering the amount of energy I feel during the day? Etc.