Yes, it’s possible to create QR codes for use in a Thunkable app but you will need to use third-party APIs to generate the QR codes.
But it sounds like you want the QR code to take them to the app store for your Thunkable app. The QR code can only hold one url, as far as I know, so it’s not going to somehow store the url and the unique information about that vehicle. You would need to use two QR codes. But if they had the app and scanned the vehicle-specific QR code then they could be taken to a unique page/screen in the app.