Pending Purchase order report : add the HS Code and Country of Origin to the list of available fields

We use the report “pending purchase order report”. 
We need 2 fields linked to the products in these reports, but they are not in the available fields.
These data are : HS code and Country of Origin, 2 product attributes that are in the tab “General” of each product (screenshot attached). 
We need these data for import documentation.