Q-in Q question ~Please Help~

Looking to do Q-in-Q on a CRS112 Mikrotik but I want to basically apply vlan stacking between two ports on the Mikrotik without knowing and having to define the specific vlans to transport.
I found that I can use vlan stacking under bridge settings, but how can I go about doing the same thing but on the switch chip instead? See attached photo for general Idea.