Is is possible for multiple filtering selects (or combo boxes) to use different sets of data inside a single JSON data store?

I have a form with multiple FilteringSelects, whose items I want to retrieve from a file on the server, but I don't want to have to have a separate file for each FilteringSelect.

I was hoping that I could use the ItemFileReadStore to load a single JSON Data file that contains the multiple sets of items that I can use to populate multiple FilteringSelects.