JetBlue absolutely is one of the DME "participating airlines," so the OP can use Resort Airline Check-In upon departure from the resort on the way back to the airport.
What this means for you, OP, is that at the end of your vacation, you can check your luggage in at at special spot in your resort's main lobby, and they will handle your checked luggage from there. You won't see it again until you see it on your home airport's baggage claim carousel. Using Resort Airline Check-In, you can also actually check in for your flight and get your baording passes. Luggage must be checked in a minimum of 3 hours before the flight time. The Resort Airline Check-In desks (one at each Disney resort) are open from 5:00 a.m. to 1:00 p.m. daily.