I've checked the description and features of Voice Converter, but that you requested is not available. The software features some presets to change the way voices sound, but nothing about the accent of the English language. You can modify everything about a voice: pitch, tempo, speed, time stretching, raspiness, smoothing, etc.
I recommend checking the official website to see exactly the features. You also have audio samples to listen for different presets present in the software.
