Webflow Ecomm SKU Values?

I’m trying to sync skus from Webflow to Airtable, but its requiring for me to map SKU values to something a column in airtable. But I have no idea what those are, I can’t access the SKUs database from the webflow CMS to alter or confirm the column type for the sync to work.

The CMS bridge requires SKU values to be mapped, but the API documentation says that the SKU values column is optional. I’ve also tried testing a variety of airtable field types to see if it appears as a mapping option on the airtable side, but nothing shows up. So what gives? Is this a bug? Same thing is happening for the field column which seems to be an object column type.

Does anyone know how to do this sync correctly of SKUs?