Allow SSH port controlled by proxy command

I'm connecting to AWS EC2 instances with AWS Session Manager, and the ssh port is dynamic which get from command "aws ssm start-session --target %h --document-name AWS-StartSSHSession --parameters 'portNumber=%p'"

Is that possible to let such proxy command control ssh port instead of a fixed value in settings?

No source files or tests are identified. Start by reproducing the AWS Session Manager command and tracing how the SSH proxy command and fixed port setting are handled; define completion as allowing the proxy command to control the SSH port while preserving a working connection.

Written by the indexing model from the issue text.