For a plugin to work with the Mobile app it needs new code writing and a new folder and zip file is created in the question distribution. On first visiting with the app a zip file is downloaded and extracted seamlessly. For the combined question type the maintainers (Tim Hunt quiz supremo being one) would have to write and test some Javasript code in a thing called angular/ionic/phonegap . In my experience it might also require some minor tweaks to the php/
css.
I had the fortune of being contracted by Elton LaClare, one of the good people at Sojo University Japan and paid to do this with my gapfill question type and it turned out not to be as complex as I feared. It took about 3 weeks from start to completion, and the OU folks are probably better at that type of thing than I am. I am not suggesting they are going to do that update, just that that they are the experts.