How to get RZ11 profile parameters details remotely?

I am looking to retrieve following Session time and password profile parameters for SAP via SAP JCo, via the RFC-enabled function module TH_GET_PARAMETER. How to know the details of the parameters of this function module, or any other RFC-enabled function module generally speaking (without access to the SAP backend system).

Examples of profile parameters:

1. rdisp/gui_auto_logout
2. login/min_password_lng
3. etc.

the following code works well:

It connects to RFC "TH_GET_PARAMETER", which has one input and one output. You need to input the respective parameter and print the output.

import com.sap.conn.jco.*;

public class GetPasswordParameters {
    public static void main(String[] args) {
        try {
            JCoDestination destination = JCoDestinationManager.getDestination("SAP-ECC");
            JCoFunction function = destination.getRepository().getFunction("TH_GET_PARAMETER");

            if (function == null) {
                throw new RuntimeException("Function TH_GET_PARAMETER not found in SAP system.");
            }

            // Set parameters to be retrieved
            String[] parameterNames = {
                    "rdisp/gui_auto_logout",
                    "login/min_password_lng",
                    "login/min_password_digits",
                    "login/min_password_letters",
                    "login/min_password_lowercase",
                    "login/min_password_uppercase",
                    "login/min_password_specials",
                    "login/password_expiration_time",
                    "login/password_change_for_SSO",
                    "login/password_history_size",
                    "login/multi_login_users",
                    "login/fails_to_session_end",
                    "login/update_logon_timestamp"
            };

            // Populate the parameter table
            for (String parameterName : parameterNames) {             
        function.getImportParameterList().setValue("PARAMETER_NAME",parameterName);
function.execute(destination);
String value = function.getExportParameterList().getString("PARAMETER_VALUE");
System.out.println(value);
        }
} catch (JCoException e) {
            e.printStackTrace();
        }
    }
}