create_bastion.json

    {
        "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
        "contentVersion": "1.0.0.0",
        "parameters": {
          "applicationId": {
            "type": "string",
            "defaultValue": "application",
            "metadata": {
              "description": "Application id - will be used as stem for resource names"
            }
          },
          "location": {
            "type": "string",
            "defaultValue": "[resourceGroup().location]",
            "metadata": {
              "description": "Location for all resources."
            }
          }
        },
        "variables": 
        {
            "vnetName": "[concat(parameters('applicationId'), '-vnet')]",
            "bastionName": "[concat(parameters('applicationId'), '-bastion')]",
            "bastionSubnetName": "AzureBastionSubnet",
            "ipName": "[concat(variables('bastionName'), '-ip')]"
        },
        "resources": [
        {
            "apiVersion": "2019-02-01",
            "type": "Microsoft.Network/publicIpAddresses",
            "name": "[variables('ipName')]",
            "location": "[parameters('location')]",
            "sku": {
                "name": "Standard"
            },
            "properties": {
                "publicIPAllocationMethod": "Static"
            },
            "tags": {}
        },
        {
            "apiVersion": "2018-10-01",
            "type": "Microsoft.Network/bastionHosts",
            "name": "[variables('bastionName')]",
            "location": "[parameters('location')]",
            "dependsOn": [
                "[resourceId(resourceGroup().name, 'Microsoft.Network/publicIpAddresses', variables('ipName'))]"
            ],
            "properties": {
                "ipConfigurations": [
                    {
                        "name": "IpConf",
                        "properties": {
                            "subnet": {
                               "id": "[concat(resourceId('Microsoft.Network/virtualNetworks', variables('vnetName')), '/subnets/', variables('bastionSubnetName'))]"
                            },
                            "publicIPAddress": {
                                "id": "[resourceId(resourceGroup().name, 'Microsoft.Network/publicIpAddresses', variables('ipName'))]"
                            }
                        }
                    }
                ]
            },
            "tags": {}
        }
    ]
}