Within the following JSON, I want to place variables to store titles or categories in Copilot Studio. What is the process to be able to take the variables within the JSON?
What is the way to call variables from Copilot Studio to this JSON?

{ "input": [ { "_users_id_requester": "657", "content": "NOSE", "itilcategories_id": "135", "name": "NOSE", "type": "1" } ] }

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I’m trying to figure out how to declare variables within a JSON. My expectation is to be able to call those variables within the JSON.