aws optional parameter using executeAwsAPI in automation runbook

Question

My goal is to use the following command:

aws iam list-users --max-items 10

But I want the parameter max-items to be optional.

I am using the following runbook (It just the relevant parts):

parameters:
  MaxItems:
    type: Integer
    description: (Optional) the maximum number of items
mainSteps:
  - action: 'aws:executeAwsApi'
    inputs:
      Api: list-users
      Service: iam
      MaxItems: '{{MaxItems}}'

The problem is max-items don't have default value so is it possible to make this parameter optional?