Seeing how you have a full structure you are wanting to import, creating a YAML file might be worth considering. I had a complex data structure with over 250 properties that I was wanting to import so I placed it into a yaml file and set up the top class in the Get Statement which them imported the top class as Data and all the embedded classes as Embedded classes. Data gets generated as concrete classes with associated tables, embedded is marked as concrete but no tables are generated.
The link below provides details on the approach I used: