Edit email delivery options programmatically - reportingservice2010

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C#3.5

I created new subscription with delivery method is "Report Email Server"

I provided email delivery option Email TO. I did not enter Email CC and Email BCC.

Programmatically I retrieved data using "GetSubscriptionProperties()" method.

I want set Email CC but output parameter "ExtensionSettings"."ParameterValues collection does not have reference to CC because original subscription had Email To only.

How do I set Email CC using "SetSubscriptionProperties()" method ?

What I have tried:

var ret = rsClient.GetSubscriptionProperties(SubscriptionIDs[i], out es, out description, out objAS, out status, out eventtype, out matchdata, out pv);
                        
((WE.SSRSAdministration.SSRSServer.ParameterValue)(es.ParameterValues[0])).Value = EmailTo;
((WE.SSRSAdministration.SSRSServer.ParameterValue)(es.ParameterValues[2])).Value = Render;
rsClient.SetSubscriptionProperties(SubscriptionIDs[i], es, description, eventtype, matchdata, pv);