I am prototyping an application that has some complex (100’s of fields) data types, and I may need to iterate on a few examples.
Is there a way to programmatically load / define the structure of a Data Type?
Nope 
One approach to achieving this is by defining a data structure called “Data,” which includes text fields such as Field 1, Field 2, Field 3, and so on. Additionally, you can introduce a new field called “Data Type,” which can either be a text value or an option set value.
To implement the desired functionality, you can perform a search specifically targeting Data with a Data Type matching a specific value, such as “Courses.” Then, you can display the relevant data associated with each Data Type when someone searches for “Courses” as desired.
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