score:3
The only way to find out, is to call the airline and ask them directly. It can be done, but the airline is not required to do it.
Even if the agent on the phone says "yes", it's still partially dependent on the mood and good-will of the check-in agent at the airport. It's a fair bit of work and requires experience that not all check-in agents have.
Last time we interlined on separate tickets, the agent had to call in a supervisor who (fortunately for us) had some extra time and turned this into a training session for the agent. It still took 20 minutes or so.
Hope for the best but plan for the worst: There is no harm in trying but make sure that your itinerary is viable even if you have to manually transfer your bags (including customs, security, check-in & drop-off, etc.)