I'm also working on something like that for myself (because of a colicky baby and hearing that low FODMAP diets help). Right now I have basic schema.org recipe ingestion working.
I'd be interested in chatting about it, but you dont have any contact info listed in your profile.
Either if you (x86mitch / matthuggins) are welcome to them if of interest:
Nutrition Works
https://www.dropbox.com/s/iyvai1jbredx6n9/Screenshot%202019-...
Nutrition Engine
https://www.dropbox.com/s/hchcz4vciik1w28/Screenshot%202019-...