How to Add custom fields to Duda schema markup

1.  Open your JSON Schema App dashboard and go to Manage Schema → Product
2.  Select the product you want to update and click on Edit Schema
3. Use the Add Field option to include additional attributes like Brand, GTIN, MPN, Color, Size, or Material
4. Enter the required values in the fields provided
5. Click Save Schema to apply your changes

Once saved, the tool will automatically update the JSON-LD structured data for that product in the background.