How to Add custom fields to HubSpot schema markup

  • Open the JSON Schema App dashboard.
  • Navigate to Manage Schema → Product.
  • Choose the product you want to update and click Edit Schema.
  • Use the Add Field option to include additional attributes such as Brand, GTIN, MPN, Color, Size, or Material.
  • Enter the required values and click Save Schema.

The app will automatically update the JSON-LD structured data for that product in the background.

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