Theoretically, ACC/AccA has that function, it's called "charging power control" and it lets you set limits for both voltage and current. Problem is, so informs us the app, "unfortunately not all devices/kernels support this feature", and unfortunately I've had no luck getting this to work on the Pro1, either. Within the app, there's also no way to find out whether the device or the kernel is to blame...
Another cool feature doesn't work with the Pro1, either: "prioritize battery idle mode": "This allows supported device to draw power directly from the external power supply when charging i