Extending the woocommerce rest api

I would like to extend the woocommerce rest api to include data of its 'booking' extension plugin. Currently this extension does not have default endpoints provided by the rest api.

So far I have created a plugin, and I've added the following code;

add_filter( 'woocommerce_rest_prepare_product', 'custom_data');

function custom_data($response, $object) {
        if( empty( $response->data ) )
            return $response;

        $response->data['meta_data'] = get_post_meta( $object[ID], 'availability', true);
        return $response;
    }

When I call the end point /products only the default data outlined by woocommerce is still called my little add on is no where to be found.

I don't even know where to find the above filter as I just saw this posted on a webpage and I tried to get it to do what I wanted, don't know if this is the correct direction to go down either. Webpage: https://francescocarlucci.com/woocommerce/woocommerce-api-custom-data-default-endpoints/#more-96

The above was me trying to extend the api but I also decided to try making a custom endpoint to see if I can get my desired outcome but so far I've just made a endpoint which calls but I have no idea what to write to retrieve the data I want.

custom end point code:

function register_custom_route() {
            register_rest_route( 'ce/v1', '/bookable',
                  array(
                    'methods' => 'GET',
                    'callback' => 'get_bookable'
                  )
          );
        }


        function get_bookable( ) {
            return array( 'custom' => 'woocommerce here' );
//What code do I write here :(

        }

Is there anyway I can achieve what I want under one of the above methods? I'm quite new to dev and I'm familiar with javascript not PHP hence my need to want to use the rest api as I would like to use wordpress/woocommerce as a headless cms.

So far the closets example I've come to has been shown on this question Creating WooCommerce Custom API

this is only part of my code. some variable not defined. and this just concept. hopefully, you can modify as per your requirement.

    public function __construct() {     
    $this->template_url = apply_filters( 'woocommerce_template_url', 'woocommerce/' 
);
    $this->api_namespace = 'wc/v';
    $this->base = 'home';
    $this->api_version = '2';       
    add_action( 'woocommerce_loaded', array( $this, 'register_hooks' ) );
}

    $namespace = $this->api_namespace . $this->api_version;     
         register_rest_route(
            $namespace, '/wclogin/',
            array(
                'methods'  => 'GET',
                'callback' => array( $this, 'wc_login'),
        )
    );



   function wc_login($request){


    $user = get_user_by('email', $request["email"]);

    //bad email
    if(!$user){
        $error = new WP_Error();
        $error->add('invalid', __('<strong>ERROR</strong>: Either the email or password you entered is invalid.'));
        return $error;
    }
    else{ //check password
        if(!wp_check_password($request["password"], $user->user_pass, $user->ID)){ //bad password
            $error = new WP_Error();
            $error->add('invalid', __('<strong>ERROR</strong>: Either the email or password you entered is invalid.'));
            return $error;
        }else{
            return $user; //passed
        }
    }

}