Hi Tomek,
I’ve just replied to you by email, but in case if anyone else has similar task – I’ve just added new use_parent_id attribute in our development version. It can be used in all “products” shortcodes. Attribute is set to no by default, but if you will set it to yes it should solve your task, e.g.:
[alg_product_meta name="total_sales" use_parent_id="yes"]
Hope that helps.
Best regards,
Tom