Add JSONDataset example to demo project

[rashidakanchwala]

Description

Add JSONDataset example dataset to our demo project.

cc - @stephkaiser

Context

Why is this change important to you? How would you use it? How can it benefit other users?

Possible Implementation

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Possible Alternatives

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Checklist

• [ ] Include labels so that we can categorise your feature request

[rashidakanchwala]

there's duplicate issue so closing this one