How can I do some functionality if annotation present?

So, the problem is next: I have a class that is responsible for WebDriver. Every WebDriver object is a Singletone so, I use ThreadLocal for use this driver in many tests.

private static final ThreadLocal<WebDriver> threadLocalScope = new ThreadLocal<WebDriver>() {
    @Override
    protected WebDriver initialValue() {
        ConfigProperty configProperty = new ConfigProperty();
        System.setProperty(configProperty.getChromeDriver(), configProperty.getUrl());
        ChromeOptions options = new ChromeOptions();
        options.addExtensions(new File(configProperty.getChromeExtension()));
        driver = new ChromeDriver(options);
        driver.manage().window().maximize();
        return driver;
    }
};

public static WebDriver getDriver() {
    return threadLocalScope.get();
}

As you can see, when the driver start it install some extension for Google Chrome, but not in each test this extension is necessary.

So, I wont to create an Annotation something like @InstallExtension, and in runtime see for this. If annotation is present under my test it will install for WebDriver this extension, in other way - not. How can I do it?