Google Product Feed for WooCommerce

Currently, the plugin allows creating multiple feeds for Google Merchant Center, which is great for setting up Local Inventory per physical location. However, all feeds currently use the same stock attribute by default, which means that when we try to create separate feeds for different locations, Google receives the total stock across all locations rather than the stock specific to that location.

Allow users to select which stock attribute (quantity) to use for each feed.

This would enable one WooCommerce install to correctly provide location-specific stock levels for multiple feeds (e.g., four different physical stores) without duplicating or incorrectly reporting stock.

Ideally, this should support existing custom stock attributes already maintained in WooCommerce.