EZ Exporter has had the ability to export Product Metafields for some time now, but not Product Variants. We've recently finally added support to export Product Variant Metafields.

This option allows Shopify store owners to export custom field data they've added to their product variants. In addition, other standard Shopify fields that Shopify themselves store in the Product Variant Metafields, such as the HS Tariff code, can now be exported as well.

To export the HS Tariff Code assigned to the product variant, simply use the key harmonized_system_code.