vikonik Vikonik, There are a couple of things named "Qt". Please clarify.
Adafruit has a Qt standard for I2C and A/D pins on an JST-PH connector. I don't know of anyone making a board with these connectors for BL parts, but Adafruit sells boards with a similar RISC-V part, e.g. https://www.adafruit.com/product/5405
For the Qt software that Asaki speaks of, that's just going to be a bad fit for a 32-bit RISC-V board. You could probably weave the development tools into the IDE. The licensing will be awkward. The baremetal builds can help you bring up without a Linux-like operating system under it, but it will still be a lot of work. You may find it easier to work with Nuttx on the Bouffalo BL602/BL604 parts. Lupyuen, and to a lesser extent, myself, have done a series of Nuttx BL602/BL604 projects and articles on that combination, including the type of touch GUI with real drivers like you might normally build with Qt.
There's also a standalone PyQt that runs on MicroPython, but I don't know much about it. I'd guess it's approximately like Nuttx above, but I'd expect it to be more RAM-heavy.