This is definitely a very advanced request, so we haven’t got any nice import menu to do it. But we do have a structured JSON file format called Agenda Archive. What I would recommend is that you export a note as Agenda Archive (File > Export), change the file extension from .agenda to .zip, and unzip the file. You should find the JSON data in there, and you should be able to see the structure of a note.
You could also export a whole project with some notes, and do the same trick as above.
The idea would be to write a script that takes your data, and generates JSON files, which you can then zip up, change the file extension to .agenda, and import.
Not trivial, but it sounds like you have the skills to do this sort of thing.