CDK use existing CloudFormation Output Value in AWS Server + StepFunction

import * as cdk from "aws-cdk-lib";
import * as lambda from 'aws-cdk-lib/aws-lambda'
import * as sfn from 'aws-cdk-lib/aws-stepfunctions'

export default class CdkStack extends cdk.Stack {
  constructor(scope?: Construct, id?: string, props: StackProps) {
    super(scope, id, props);
    // Get the CloudFormation Output value that is already existing in AWS Server with 'Export name' in Output values
    const token = cdk.Fn.importValue(['Export Name' in an already existing Cloud Formation Stack])
        
    // Get the Exising Lambda Function
    const createMediaLambda = lambda.Function.fromFunctionArn(
      this,
      '[Sample String value for debugging]',
      '[lambda ARN]' //cloud formation import!
    );
    
    // Create the json that AWS can understand and transform
	const createMediaJson = {
      Type: 'Task',
      Resource: token,
      Parameters: {
        contentId: '$.contentId'
      },
      Next: 'UpdateStatusWaiting'
    }
	
    // Make a custom State
    const createMedia = new sfn.CustomState(this, "CreateMedia", {
      stateJson: createMediaJson
    });
    
    // Make a chain for the Step Functions
    const chain = sfn.Chain.start(createMedia).next(updateStatusWaiting);
	
    // Create a StateMachine (for Step Functions)
    const stateMachine = new sfn.StateMachine(this, "stateMachine", {
      definition: chain,
      timeout: Duration.seconds(100),
    })
	
    // Grant Invoking Access for the State Machine to run the Lambda function.
    createMediaLambda.grantInvoke(stateMachine)
  }
}