Output.Format usage in Pulumi

DemoStack.cs

using System;
using System.Collections.Generic;
using Pulumi;
using Pulumi.Aws.DynamoDB;
using Pulumi.Aws.DynamoDB.Inputs;
using Pulumi.Aws.Iam;

namespace Demo
{
    public class DemoStack : Stack
    {
        public DemoStack()
        {
            var demoTable = new Table("demo", new TableArgs
            {
                Attributes = new List<TableAttributeArgs> {
                    new TableAttributeArgs {
                        Name = "DemoId",
                        Type = "S"
                    }
                },
                HashKey = "DemoId",
            });

            Console.WriteLine(demoTable.Arn);

            var policyDoc = Output.Format($@"{{
                ""Version"": ""2012-10-17"",
                ""Statement"": [
                    {{
                        ""Effect"": ""Allow"",
                        ""Action"": [
                            ""dynamodb:*""
                        ],
                        ""Resource"": [
                            ""{demoTable.Arn}"",
                            ""{demoTable.Arn}/index/*""
                        ]
                    }}
                ]
            }}");

            var editPolicy = new Policy("demo-dynamodb-edit", new PolicyArgs
            {
                PolicyDocument = policyDoc
            });
        }
    }
}