Serverless Framework and CloudFormation coexistence

We are creating a S3 bucket with CloudFormation yaml, then we create a Lambda function with Serverless Framework.

If we add s3 events to lambda on the Serverless Framework yaml using the bucket created in CloudFormation it works perfectly.

But if we modify s3 bucket Cloud Formation Stack, it remove all s3 events added with Serverless Framework.

Is posible to keep this s3 events in lambda function when we launch the CloudFormation s3 stack ?

Thanks !!