How to test an application deployment with variables saved as JSON

I have an application that uses a lot of variables from a JSON file, when it is getting deployed, sort of similar to Ansible type of deployments.

Variables would be things like : number of vCPUs required, URL to download images...etc, lots of different variables.

Is there any best practice or an automation framework/tool that I can use to keep manipulating these variables in the JSON file and redeploy, maybe even changing a number of these variables and testing.