In EZ Exporter's Product export, you can select the field variants.inventory_levels.total_incoming to export the total incoming quantity for the variant via Purchase Orders or Transfers.

To only export the quantity for a specific location, you use the formula below in the Calculated Fields (replace "Warehouse A" with your location name):

search_attributes(search_attributes({{ variants.inventory_levels }}, "Warehouse A", search_key="location_name", result_key="quantities"), "incoming", search_key="name", result_key="quantity")