Wix data feed to Google Merchant Centre giving me thousands of errors!

I am completley stuck as to what to do here.

I have 1467 products / variants that are

Missing value [age group]
Missing value [color] - I am UK so I spell it colour anyway.
Missing value [gender]

I can’t find any way to create so called links between differences in attributes.

Surely there has to be an easy, automated way to rectify this - considering its 250ish products each with several variants, amounting to an insane amount of time.

I have tried help on google merchant, I have tried looking through forums and can’t seem to find an answer as to what it is I need to do to make the stars align and the data feed work as expected.

Has anyone come across this? Have a work around? A fix?