code: def cognito_identity_identity_pool_arn(self, lookup, default=None):
      
      identity_pool_id = self.cognito_identity_identity_pool_id(lookup, default)
  
      if identity_pool_id == default:
        return default
  
      # The ARN has to be constructed because there is no boto3 call that returns the full ARN for a cognito identity pool
      return "arn:aws:cognito-identity:{{{{REGION}}}}:{{{{ACCOUNT}}}}:identitypool/{}".format(identity_pool_id)
docs: Args:
          lookup: Cognito Federated Identity name, proto0-cms-identity-pool
          default: the optional value to return if lookup failed; returns None if not set
  
      Returns:
          the constructed ARN for the cognito identity pool, else default/None