Yes, but not within the property management system. The entire mobile check-in/checkout platform is a web based interface that very minimally interacts with the PMS and has to be monitored separately. Some hotels are better than others about monitoring that system for mobile chat requests, checkouts, etc.

Currently, Marriott hotels operate with one of four PMS (FSPMS, Lightspeed, Opera, or FOSSE). "In the near future" (for several years now), Marriott will standardize their PMS for all hotels and everything will be better integrated and these types of mobile app/hotel interactions will be streamlined.