Hello,
I would recommend you store a JSON string as the value. That way you can store and append multiple values under the same short_name. You can do this via the methods outlined here:
https://www.adamsmith.haus/python/answers/how-to-create-a-json-object-in-python
With more of a description on how those functions work here:
https://docs.python.org/3/library/json.html
You could also store values under multiple short names, but depending on the size and use of the data this is not a good solution, but depending on certain use cases this may be a good solution.
-Trey