google listing ads plugin add [unit pricing measure] [unit_pricing_base_measure]

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`we have added the plugin, in the merchant center we see an error, google wants the following attributes:
[unit_pricing_measure] -> we have ml and g
[unit_pricing_base_measure] -> 1000

How can we add these 2 new attributes to our google shopping feed?
The issue is that unit_pricing_measure we have millilitres and grams, how to deal with that?

Thanks