code: func WithCustomizedFlag(s ...string) Option {
  	return func(o *options) {
  		if len(s) > 0 {
  			o.FlagName = s[0]
  		}
  		if len(s) > 1 {
  			o.FlagDefault = s[1]
  		}
  		if len(s) > 2 {
  			o.FlagUsage = s[2]
  		}
  	}
  }
docs: // WithCustomizedFlag is an option to customize config flag for plugin in ForPlugin.
  // The parameters are used to replace defaults in this order: flag name, default, usage.