"Sugar" isn't so much hard to track, as not required to be labelled. Since fructose and lactose sugars are healthy for you these don't need restricting, eg the "sugar" that would be in a grapefruit is good sugar!
So since the "sugar" value would be including positive healthy foods, and not all foods need to have that labelled on the packet anyway, it actually would not tell you a single useful thing about your day to record that value.
If you feel you need to reduce sugar then reduce your own adding of it to tea/coffee, and avoid cakes, biscuits, baked goods and sugary treats.
Deb, in New Zealand