How to assign Ctrl+scroll for Two finger scroll on Magic Mouse?

Hi everyone,

I'm using 3D software and would like to assign Ctrl+scroll for Two finger scroll on Magic Mouse. However, I don't see a two-finger scroll in the section you pick Trigger (only 1 finger scroll up and down).

Is it possible what I want to do with BTT?

Thanks in advance!

I still cannot find how to do this. Would be great if someone could help me out. Thanks!