How to create some fields in Premium items Module

Hi, I am new in Shopware 5. I want to create some fields in Premium item module.
Please check the screenshot.

I have checked there is no any attribute table for Premium items.

Please tell me how I can create custom fields here

Seems a cross-post to StackOverflow. Let’s follow the subject there: How to add custom field in Premium items Module in Shopware 5? - Stack Overflow

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