ameliaw95025277 - Can you try and help us track down the answer with the Target team here? Since the Target extension for Launch is built and maintained by the Target team, this is a question we may need their input on.
I was able to track down a bit of information that you might be able to use in a workaround until that functionally is built out.
You can fire different mboxes using the Custom Code action in the Core Extension along with getOffer/applyOffer methods of at.js.
Launch by Adobe Reference Architectures
@MihneaD - Any thoughts here?