How to hide parameters like "password" in SSM Create Document parameter during input?

I am trying to create an SSM command document from the console and in the Parameter section, I am asking the user to pass "username" and "password". The parameter type is "String" but the requirement is that the "password" should not show the input given by the user. I have tried "NoEcho": "true" and "type": "SecureString", both are not accepted by the SSM. I have attached a sample JSON file with the error.