Here is a handy app that lets you control your Tesla car’s features from your smartwatch or smartphone. Remote S for Tesla lets you unlock/lock your car, start/stop charge, control heating and A/C, flash lights, open/close charge port, and track car location. There is an in-app browser that lets you use a webpage to control your car.
Remote S for Tesla is not an official app, but it does have a lot of potential. This is a paid app.