如何将国家/地区代码添加到产品网址？

I want to add %country% to the product URL. Under %country%, I mean $woocommerce->customer->get_country(). At least as a parameter, like domain.com/shop/productname?country=germany. But in the end, I want to achieve something like domain.com/germany/shop/productname.

I tried to do something with the following functions:

add_rewrite_endpoint()
add_rewrite_rule()
add_rewrite_tag()

But all the code examples that I have met put me stumped. I'm not very good in routing. If someone describes my case - I will be very grateful!