Core team member here. This is indeed something you can already do today, but more importantly which is our next area of focus for development and improvements: https://remotestoragejs.readthedocs.io/en/latest/data-module...
We'd be happy about any and all feedback and ideas about this specific topic. Our community forums are a good place for that: https://community.remotestorage.io
Also we can hope that the next step is standardized ways to store some data (e.g. a common key and data structure for calendar events) allowing multiple apps to read the same data =D