storage models and array

I have a question about the structure of a storage model and arrays
I have a service the returns all properties in a collection on a where using user login.
It all works fine but I want to speed us the app by loading this returned service in localstorage and then map from there as needed

Because I dont know how many properties are present, do I need to save all returned data to one array or would it be an array of arrays

if you have an example screenshot of the model structure it would be a great help
here is a screenshot of the mapping as it is now.

thanks alot, I really like this feature cheers!
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