Write me a python function

I need a python function built. You will be interacting with the Google Maps API. The function should accept device destination coordinate, and an integer value 'x' as arguments. Then return the coordinates of a point x(km) from the device's current position along the Google Maps road route. Note. No graphical information needed, just do it programmatically. Hola at me for clarification if you feel you can quickly get it ready. Below is attached a rough idea of what I'm looking for.