There are a few option for what you Google will let you use as a GTIN. I use UPC for the Google GTIN. I should probably only use the word GTIN to avoid any confusion. But regardless of what the feature field is, how do you get that field inside a variant? I will worry about exporting it later I guess, but I just don't see anyway of associating the feature field to actual Variants, only the "master" product.
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