How to use the @mapbox/cloudfriend.findInMap function in @mapbox/cloudfriend

options.env.ProgressTable = tableArn;
  }

  Resources[prefixed('Task')] = {
    Type: 'AWS::ECS::TaskDefinition',
    Properties: {
      TaskRoleArn: cf.ref(prefixed('Role')),
      Family: options.family,
      ContainerDefinitions: [
        {
          Name: cf.join('-', [prefixed(''), cf.stackName]),
          Image: cf.join([
            cf.accountId,
            '.dkr.ecr.',
            cf.findInMap('EcrRegion', cf.region, 'Region'),
            '.',
            cf.urlSuffix,
            '/',
            options.service,
            ':',
            options.serviceVersion
          ]),
          Cpu: options.reservation.cpu,
          Privileged: options.privileged,
          Environment: unpackEnv(options.env, mounts.mountPoints),
          MountPoints: mounts.mountPoints,
          Command: ['watchbot', 'listen', `${options.command}`],
          Ulimits: [
            {
              Name: 'nofile',
              SoftLimit: 10240,