I want to suggest one thing: take a reference weekly diet, (or multiple such diets). One example would be

500g chicken, 500g cauliflower, 20g cumin seeds, 2kg rice, 300g groundnuts, 1l milk, 20g cocoa, 50g ginger, 400g tomato.

Accumulate all the component nutrients. And average this over a day.

Now when I search for lotus seeds, I want to see how much nutrition they have relative to this diet. You could argue that RDA essentially serves a similar purpose and that might not be too far off but what I'm interested in knowing is how much diversity a food item is adding for me.