Add possibility to automatically calculate calories

I would like to request the feature that the calory amount of a dish can be automatically calculated.

Usecase:
Total calories and calories per serving will be displayed alongside the other information.
Add the possibility to filter for dishes based on calory amount.

How would this be possible:
The app should automatically generate a list of ingredients, where a user can add the number of calories per ingredient (cal/100g). This info will, of course, be reused in all recipes. (so one list for recipes, one list for ingredients) Maybe it is even possible to reuse an existing DB for standard values?
About the amount: I guess you would have to use the same unit for the same ingredient everywhere (1 Piece, 10g, 0.5l, ...)

The issue names no files, tests, or entry points, so first map the existing recipe and ingredient data and the dish-filtering flow. Define how reusable calorie values, ingredient quantities, total calories, per-serving values, and calorie-based filtering should work before implementation; done means these values are shown and filterable consistently.