How to Identify Required Fields for Specific Product Types in the SP API

I have a question regarding the SP API. For different product types, the required fields vary. How can we identify the required fields for a specific product type?

In the Product Definition API, we can retrieve the schema for a product type, such as ENGINE_AIR_FILTER, but it doesn't explicitly list the required fields. Instead, it provides the complete JSON schema, which includes many conditionally required fields. Is there a tool available that can help identify the required fields for a specific product type?

While using the JSON listing feed to submit data, we encounter issues because the feed requires specific fields. Could you help us understand how to identify the required fields for each product type and ensure the feed submission succeeds?