Forward multiple ports while starting the session

**Describe the issue**

If someone has to forward multiple ports they have to use the start-session command multiple times. For example, I want to forward port 8000 and 8080 to my local machine, then I'll do

```
aws ssm start-session --target --region --document-name AWS-StartPortForwardingSession --parameters '{"portNumber":["8080"], "localPortNumber":["8080"]}

aws ssm start-session --target --region --document-name AWS-StartPortForwardingSession --parameters '{"portNumber":["8000"], "localPortNumber":["8000"]}
```

Is there (or could there be) any easy way to achieve this multiple port forwarding?

**Expected behavior**

Ideally, this should be achieved by some command like this:

```
aws ssm start-session --target --region --document-name AWS-StartPortForwardingSession --parameters '{"portNumber":["8080", "8000"], "localPortNumber":["8080", "8000"]}
```