Vlad Yes this is possible on Arc but I'll use Firefox + Sidebery as an example instead to make it easier to understand.
Sidebery on Firefox lets me assign a container to a tab group. In this video I switch between two tab groups, one in the default container where I'm logged in and another in a different container where I am not logged in.
In this video I switch between the same tab open in two different saved windows. I'd like to be able to assign a container to a saved window so that new tabs would be opened in the container assigned to that saved window.
If you'd like I can make a feature request for this specifically but considering it's functionality based on a feature not present in Orion but being requested in this thread I figured I'd post about it here.