How to use the @aws-cdk/aws-certificatemanager.Certificate.fromCertificateArn function in @aws-cdk/aws-certificatemanager

constructor(scope: cdk.Construct, id: string, props: LoadBalancedFargateServiceAppletProps) {
    super(scope, id, props);

    const vpc = new Vpc(this, 'MyVpc', { maxAZs: 2 });
    const cluster = new Cluster(this, 'Cluster', { vpc });

    let domainZone;
    if (props.domainZone) {
      domainZone = new HostedZoneProvider(this, { domainName: props.domainZone }).findAndImport(this, 'Zone');
    }
    let certificate;
    if (props.certificate) {
      certificate = Certificate.fromCertificateArn(this, 'Cert', props.certificate);
    }

    // Instantiate Fargate Service with just cluster and image
    new LoadBalancedFargateService(this, "FargateService", {
      cluster,
      cpu: props.cpu,
      containerPort: props.containerPort,
      memoryMiB: props.memoryMiB,
      publicLoadBalancer: props.publicLoadBalancer,
      publicTasks: props.publicTasks,
      image: ContainerImage.fromRegistry(props.image),
      desiredCount: props.desiredCount,
      environment: props.environment,
      certificate,
      domainName: props.domainName,
      domainZone

const cluster = new Cluster(this, 'Cluster', {
      clusterName: props.domainName.replace(/\./g, '-'),
      vpc
    });

    // Configuration parameters
    const domainZone = HostedZone.fromLookup(this, 'Zone', { domainName: props.domainZone });
    const imageRepo = Repository.fromRepositoryName(this, 'Repo', 'reinvent-trivia-backend');
    const tag = (process.env.IMAGE_TAG) ? process.env.IMAGE_TAG : 'latest';
    const image = ContainerImage.fromEcrRepository(imageRepo, tag)

    // Lookup pre-existing TLS certificate
    const certificateArn = StringParameter.fromStringParameterAttributes(this, 'CertArnParameter', {
      parameterName: 'CertificateArn-' + props.domainName
    }).stringValue;
    const certificate = Certificate.fromCertificateArn(this, 'Cert', certificateArn);

    // Fargate service + load balancer
    new ApplicationLoadBalancedFargateService(this, 'Service', {
      cluster,
      taskImageOptions: { image },
      desiredCount: 3,
      domainName: props.domainName,
      domainZone,
      certificate
    });
  }
}