unit_pricing_base_measure

I’m using the HikaShop Google / Meta Products feed plugin to generate an XML feed for Google Merchant Center.

In the plugin settings I can map:
• Multipack
• Unit pricing measure

But I cannot find any option to map the missing attribute:
• unit_pricing_base_measure (Google attribute: unit_pricing_base_measure)

Could you please confirm:
1. Is unit_pricing_base_measure supported by the plugin?
2. If yes, where can I configure/match it in the plugin settings?
3. If it’s not currently supported, is there a recommended workaround (e.g., mapping a custom product field, adding a custom XML tag via plugin override, or a planned update)?

My goal is to set unit pricing correctly for products sold in packs (e.g., unit_pricing_measure = 120 ct, and unit_pricing_base_measure = 1 ct) to avoid Merchant Center warnings and ensure correct display.

Thanks in advance for your help.

Best regards,
José Ángel