library/car_driver/controllers/main.py

from odoo import http
from odoo.addons.car_app.controllers.main import Cars

class Driver(Cars):
    @http.route()
    def list(self, **kwargs):
        response = super().list(**kwargs)
        if kwargs.get('available'):
            Car = http.request.env['car.data']
            cars = Car.search([('is_available', '=', True)])
            response.qcontext['drivers'] = cars
        return response