How can I add food grade after getting the web api set up?

I’m creating an app that scans a food barcode, and after reading the barcode the user will receive a food grade (A, B, C, D, E) or nutriscore. I have the barcode scanner and the web api set up, but I don’t know what properties to use to display the nutriscore of that specific food object.

This is my database:
These are the blocks I have so far:

A post was merged into an existing topic: How to create nutrition app with ocr scanner?