How to use the @aws-cdk/aws-elasticloadbalancingv2.ApplicationTargetGroup function in @aws-cdk/aws-elasticloadbalancingv2

const greetingService = new ecs.Ec2Service(this, 'greeting-service', {
      cluster: cluster,
      desiredCount: 2,
      taskDefinition: greetingTaskDefinition
    });

    // Internal load balancer for the backend services
    const internalLB = new elbv2.ApplicationLoadBalancer(this, 'internal', {
      vpc: vpc,
      internetFacing: false
    });

    const internalListener = internalLB.addListener('PublicListener', { port: 80, open: true });

    internalListener.addTargetGroups('default', {
      targetGroups: [new elbv2.ApplicationTargetGroup(this, 'default', {
        vpc: vpc,
        protocol: 'HTTP',
        port: 80
      })]
    });

    internalListener.addTargets('name', {
      port: 80,
      pathPattern: '/name*',
      priority: 1,
      targets: [nameService]
    });

    internalListener.addTargets('greeting', {
      port: 80,
      pathPattern: '/greeting*',