Display period totals for any graph in My Nutrition and Wellness

I am recording my calories, carbs, fat and protein in a spreadsheet on a weekly basis, just to get an idea how different balances of the four affect weight loss. At the moment I produce a bar graph for a custom range of 7 days (Sun-Sat) and then add the total of each bar with a calculator to get the weekly total.

It would be useful if the app and website displayed the total for the period shown in any graph, i.e. added up each bar and displayed it somewhere on the screen. Ideally, this should work for whatever time period is selected.