How to send a parameter that has two names

I need to submit params with multiple names I tried using the following but I get errors.

I am trying to execute the following {
    "command": "create_subject_Visit",
    "params": {
        
            "subject_data.pid":
            "subject_data.primaryname":"teamqa30" ,
            "subject_data.secondaryname":"TQAtest30" ,
            "subject_data.tertiaryname":"" ,
            "visit_data.session_type_id": "",
               "visit_data.session_type_name": "Scheduled" ,
               "visit_data.session_id": "",
               "visit_data.session_name": "Baseline" ,
               "visit_data.visit_date": "1/01/2017"
    }
}