Create DevTest Lab attached to exsiting VNet/Subnet (redacted ARM template)

azuredeploy.json

{
    "$schema": "http://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {...},
    "variables": {...},
    "resources": [
        {
            "type": "Microsoft.Resources/deployments",
            "name": "subnetTemplate",
            "apiVersion": "2017-05-10",
            "resourceGroup": "[variables('labVirtualNetworkResourceGroup')]",
            "properties": {
                "mode": "Incremental",
                "template": {
                    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
                    "contentVersion": "1.0.0.0",
                    "parameters": {},
                    "variables": {},
                    "resources": [
                        {
                            "apiVersion": "2017-10-01",
                            "type": "Microsoft.Network/virtualNetworks/subnets",
                            "location": "[resourceGroup().location]",
                            "name": "[concat(variables('labVirtualNetworkName'), '/', parameters('labName'))]",
                            "properties": {
                                "addressPrefix": "[parameters('labSubnetAddressPrefix')]"
                            }
                        }
                    ]
                },
                "parameters": {}
            }
        },
        {
            "name": "[parameters('labName')]",
            "type": "Microsoft.DevTestLab/labs",
            "apiVersion": "2018-09-15",
            "location": "[resourceGroup().location]",
            "tags": {
                "DTL": "[parameters('labName')]"
            },
            "properties": {
                "announcement": {
                    "title": "[parameters('labAnnouncementTitle')]",
                    "markdown": "[parameters('labAnnouncementMarkdown')]",
                    "enabled": "Enabled",
                    "expirationDate": null,
                    "expired": false
                },
                "support": {
                    "enabled": "Enabled",
                    "markdown": "[parameters('labSupportMarkdown')]"
                }
            },
            "resources": [
                {
                    "type": "schedules",
                    "name": "LabVmsShutdown",
                    "apiVersion": "2017-04-26-preview",
                    "location": "[resourceGroup().location]",
                    "properties": {
                        "status": "Enabled",
                        "timeZoneId": "Tokyo Standard Time",
                        "dailyRecurrence": {
                            "time": "2200"
                        },
                        "taskType": "LabVmsShutdownTask",
                        "notificationSettings": {
                            "status": "Disabled",
                            "timeInMinutes": 30
                        }
                    },
                    "dependsOn": [
                        "[resourceId('Microsoft.DevTestLab/labs', parameters('labName'))]"
                    ]
                },
                {
                    "type": "virtualnetworks",
                    "name": "[variables('labVirtualNetworkName')]",
                    "apiVersion": "2017-04-26-preview",
                    "location": "[resourceGroup().location]",
                    "properties": {
                        "externalProviderResourceId": "[variables('labVirtualNetworkId')]",
                        "subnetOverrides": [
                            {
                                "name": "[parameters('labName')]",
                                "resourceId": "[variables('labSubnetId')]",
                                "useInVmCreationPermission": "Allow",
                                "usePublicIpAddressPermission": "Allow",
                                "sharedPublicIpAddressConfiguration": {
                                    "allowedPorts": [
                                        {
                                            "transportProtocol": "tcp",
                                            "backendPort": 3389
                                        },
                                        {
                                            "transportProtocol": "tcp",
                                            "backendPort": 22
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "dependsOn": [
                        "[resourceId('Microsoft.DevTestLab/labs', parameters('labName'))]"
                    ]
                }
            ],
            "dependsOn": [
                "subnetTemplate"
            ]
        }
    ]
}