If you’ve created an attribute or field nvg-image, you will need to map Attribute
nvg-image as g:image_link.
*Just an FYI that g:image_link is Google attributes, so enter the command as is. To remove the featured image, click here.
When changing the main image for other merchants, please check the merchant attribute (to replace g:image_link if needed) on the attribute mapping section and use that attribute on the command given above. This way you can change featured image in product feed.