How to connect with SSL to Amazon Redshift Serverless

I would like to allow only SSL connections and disable non-SSL. Is it possible to do such configuration to Redshift Serverless?

[What I have researched so far]

I found in this document:

https://docs.aws.amazon.com/redshift/latest/mgmt/serverless-connecting.html

"Amazon Redshift supports Secure Sockets Layer (SSL) connections to encrypt queries and data. To set up a secure connection, you can use the same configuration you use to set up a connection to a provisioned Redshift cluster. Follow the steps in Configuring security options for connections"

When I access to:

https://docs.aws.amazon.com/redshift/latest/mgmt/connecting-ssl-support.html

I found this:

"By default, cluster databases accept a connection whether it uses SSL or not. To configure your cluster to require an SSL connection, set the require_SSL parameter to true in the parameter group that is associated with the cluster."

I think that I have to create a parameter group:

https://docs.aws.amazon.com/redshift/latest/mgmt/managing-parameter-groups-console.html

However:

"When you launch a cluster, you must associate it with a parameter group. If you want to change the parameter group later, you can modify the cluster and choose a different parameter group."

There is no option for Redshift Serverless!

And in this docs:

https://docs.aws.amazon.com/redshift/latest/mgmt/serverless-console-comparison.html

"Parameter groups - Provisioned clusters support parameter groups. Amazon Redshift Serverless does not have the concept of a parameter group. For more information about parameter groups for a provisioned cluster, see Amazon Redshift parameter groups."

=> I would like to allow only SSL connections and disable non-SSL. Is it possible to do such configuration to Redshift Serverless? If possible, I would appreciate it if you could tell me how to set it up.