How To Add Upc / Ean / Jan Under The Sku

Hi there,

Just met a problem, i want to add the UPC / EAN / JAN code under the SKU number. Is there anyway to do that?

I tried the product-features, but it gives me a trouble when i import product in bulk. I can fill the UPC number directly.

I attach the image for your reference.

Thank you for your help indeed.

Additional information: i am using V4.15. Thank you!