That's a great idea. You have my support. I can only imagine how convenient it would be. You need to use some kind of service. Take out your phone, choose the right options and section, and you're done. You know where to go or where to go. It also needs to support the launch of Google Maps and the construction of routes to objects. Here's one of the services you asked
https://limousine-service.com/limousine-service-berlin-txl-airport. But you have to understand that you can't make it alone, you need a team and a lot of money for that. If you need help, ask for it. Good luck to you!