public ConfigOptionBuilder setCommandLineOptionWithArgument( CommandLineOption commandLineOption, StringConverter converter ) {
        co.setCommandLineOption( commandLineOption );
        return setStringConverter( converter );
    }
if you want to parse an argument, you need a converter from String to Object

@param commandLineOption specification of the command line options
@param converter how to convert your String value to a castable Object
jgiven-core/src/main/java/com/tngtech/jgiven/report/config/ConfigOptionBuilder.java