What is the correct format of writing TemplateBody of CfnStackSetProps struct in go CDK v2?

I'm going to use CDK to create a stackset resources and I want to use the TemplateBody parameters.

Here is my code snippet:

import ( "github.com/aws/aws-cdk-go/awscdk/v2" "github.com/aws/constructs-go/constructs/v10" "github.com/aws/jsii-runtime-go" )

func NewMyStack(scope constructs.Construct, id string, props *awscdk.StackProps) awscdk.Stack {

stack := awscdk.NewStack(scope, &id, props)

yaml := `
AWSTemplateFormatVersion: 2010-09-09
Description: test

Resources:
  eventbridgerulecentralaccount:
	Type: AWS::Events::Rule
	Properties:
	  Description: Forward event to EventBus
	  EventBusName: default
	  State: ENABLED
	  EventPattern:
		source:
		- custom.dingtalkevent.test
	  Targets:
	  - Arn: "arn:aws:xxx"
		Id: dingtalk-eventbus-account
		RoleArn:
		  Fn::GetAtt:
		  - EventBridgeIAMrole
		  - Arn
  EventBridgeIAMrole:
	Type: AWS::IAM::Role
	Properties:
	  AssumeRolePolicyDocument:
		Version: '2012-10-17'
		Statement:
		- Effect: Allow
		  Principal:
			Service:
			  Fn::Sub: events.amazonaws.com
		  Action: sts:AssumeRole
	  Path: "/"
	  Policies:
	  - PolicyName: PutEventsDestinationBus
		PolicyDocument:
		  Version: '2012-10-17'
		  Statement:
		  - Effect: Allow
			Action:
			- events:PutEvents
			Resource:
			- "arn:aws:events:xxx"`

awscdk.NewCfnStackSet(stack, jsii.String("MyStackSet"), &awscdk.CfnStackSetProps{
	PermissionModel: jsii.String("SERVICE_MANAGED"),
	StackSetName:    jsii.String("MyStackSet"),
	AutoDeployment: &awscdk.CfnStackSet_AutoDeploymentProperty{
		Enabled:                      jsii.Bool(true),
		RetainStacksOnAccountRemoval: jsii.Bool(true),
	},
	TemplateBody: jsii.String(yaml),
	Capabilities: jsii.Strings("CAPABILITY_NAMED_IAM"),
})
return stack

}

I got the error "Resource handler returned message: "Template format error: YAML not well-formed. (line 2, column 1) (Service: CloudFormation, Status Code: 400" when I deploy it.

I've tried to create stackset via AWS console use the yaml in TemplateBody and everything works fine. I would understand how to use the TemplateBody in Go CDK.