Could you please help me. I need to use a combination of DNA physics + DNA chemistry in one region while using standard physics in another region. Similar thing is done in “dnaphysics” example with “G4EmDNAPhysicsActivator”, but it only covers DNA physics (not DNA chemistry). It is also done in “microdosimetry” example, but it also doesn’t use chemistry at all. In the end both “G4EmDNAPhysicsActivator” and “microdosimetry” use G4EmConfigurator class and SetExtraEmMode function to apply different models to different regions, but I’m not sure how can I do this with chemistry. Is it even possible?