CPQ - Use Quantity from Quote

Has anyone found a way to send more than a quantity of 1 on a quote line to a CPQ configurator? We’d like to implement quantity break pricing within the configurator, but that requires our users to be able to set a quantity before starting the CPQ configuration.

I’ve inspected the REST call between Kinetic and CPQ when pressing configure, and the line quantity doesn’t appear to be sent in any of the data.