Custom action for querying knowledge-base (json file), when values are given in lists

How to proceed with the creation of Custom-Actions that will query to the json file which i have used as knowledge base. Below is an example of data-structure of json file.

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My intention to have Chabot work like as shown in figure.

I don’t know if we can show all the values as Buttons that is there in the list and fill the slot as per user selection of the button. If we can do, so how will the Custom-Actions be. Kindly help me on this.