}

class CustomTask extends DefaultTask {
    @TaskAction
    void doSomething() {
    }

    @Option(option = "stringValue", description = "Configures a string value in CustomTask.")
    public void setStringValue(String value) {
    }

    @OptionValues("stringValue")
    public List<String> possibleValues(){
        return Arrays.asList("optionA", "optionB", "optionC", "$path")
    }