In the Docs for this mod, it mentioned that using Stock By Attribute (another mod) could let Google Merchant Center Feeder create variant products for each product.

Quote Originally Posted by Numinix
(Optional) If using attributes to offer variations of your products, install Stock by Attributes (refer to the tips section for more information)
I have Stock By Attribute installed and I have variant data for each product, but my feed doesn't show the variant data.

Is there something I am missing?