USB support in mbed OS?

Is there any USB support in mbed OS / mbed 3.0?

I want to use USBSerial on STM32F103, this seems to be quite easy in the older mbed drivers but I cant find anything for mbed OS. Would it be difficult to port the USB driver from mbed 2.0 to mbed OS?

At this point there’s no USB drivers in mbed OS yet unfortunately.