set the Alt. GL account "on-the-fly" for Shopify Orders

We would like to have a setting in the Shopify integration where we can map Shopify orders to specific Alternate GL accounts by Shopify channel. Currently, we can only choose a specific Alternate GL account for all orders or by contact - neither of which works for our business model. We have to manually set the Alternate GL account on any order that doesn't match the single specified value in the cin7 Shopify integration settings.