Need to hide a enum value from user on CLI

I have a requirement where in my yang structure I need to hide one enum value from CLI .

Yang Structure

typedef dictionary {
enum builtIn {tailf :info}
enum userDefined{tail:info}
enum undefined{} // need hide this from CLI
default undefined;

I’m not aware of any YANG constructs or Tail-f specific YANG annotations that allows you to hide an enum value from CLI.