ARM_Variable

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "myEnvironment": {
            "type": "string",
            "allowedValues": [
                "D",
                "T",
                "A",
                "P"
            ]
        }
    },
    "variables": {
        "myName": "John",
        "setting": {
            "D": {
                "environmentName": "MyDevEnvironment",
                "sku": "basic"
            },
            "T": {
                "environmentName": "MyTestEnvironment",
                "sku": "basic"
            },
            "A": {
                "environmentName": "MyAccEnvironment",
                "sku": "premium"
            },
            "P": {
                "environmentName": "MyPrdEnvironment",
                "sku": "premium"
            },
        }
    }
}