GTIN/EAN: Google Product Feed?

Hello,

I just installed and tested your plugin. It does what it says. However: With your plugin I have no option to choose the Barcode (GTIN/EAN!) for Google Product Feed (https://woocommerce.com/products/google-product-feed/). Can you update/include that so that I can choose to submit the EAN code in the feed to Google?

Thanks
Daniel