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• I'd be willing to implement this feature (contributing guide)

Describe the user story
I want to build a drift detection tool using plan output. But in the API endpoint I can get only Terraform plain output.

Describe the solution you'd like
Add JSON plan output into API response and not just plain output.

Describe the drawbacks of your solution

• Maybe will depend on "SHOWFILE" and in somecases how it handled by each implementation
• Depending on how will be implemented (raw JSON or struct): manifest changes over TF versions.

Describe alternatives you've considered

• Changing output when a plan is executed with no PR number (and then getting JSON output from TerraformOutput)
• Using an intermediary to emit JSON (i.e. Redis to put/get output).
• Just avoid Atlantis and run terragrunt/terraform plan (of course I don't want this)