In one of my group policies, I have blocked "shopping" in the "Blocked website categories" section. However there are some shopping sites that we use for business that must be accessible. So far I have added two sites to the "Allow list URL patterns" section and it works perfectly. General shopping is still blocked, but the sites that I allowed work without issue.
Note: When applying these rules and testing it is important to note that any rule changes takes a minute or two to become active. At first I thought the changes that I made did not work, but a short while later it started working.
Hope this is applicable to your situation.