Is storing data as structured data helpful to a GPT?

If I want to store knowledge files or get data back from an API call, is it “better” to store it as structured text, JSON for example or even CSV rather than unstructured? Does that help the GPT understand the content better?

If I have some product description, it naturally comes as structured data. But for more creative content, such as a description of a house, rooms, yard, furniture, etc., would making the data structured instead of just a simple paragraph give the GPT a better chance at understanding?