Consider writing the decoded JSON (which is then a jython dictionary or list of dictionaries) to a memory tag of type Document. They you can use a variety of expression functions in user interfaces or in other expression tags to extract the named contents.
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I was thinking I would try to create a SQLlite DB in a transaction group, and the app would query the DB to search for the info. That way we can have a log of the tags detected. In case an item goes missing we will have the ability to see the "Last known location" with a timestamp in a DB. I don't exactly know how to do this but that was the general idea. Could you expound on what you were describing further?