Mail Template File vs User Creation (LNCertifier::RegisterUser())

Hello Folks,why I can not specify a mail template file when I register user using C++ API (LNCertifier::RegisterUser())?

The LNRegistrationOptions class does not has a “SetMailTemplateFileName()” function.

Is there any way i can specify the mail template file while user creation with the help of LNCertifier class

Any help is more than welcome…

Sunil Rashinkar