I have tried this, too, and given up. In my opinion, the questionnaire functionalities are not yet useable in online settings. Once the form type is fully developed, this might be an option.
I last looked into displaying the questions and answer options and then have participants enter them manually (y/n, 1/2/3/4/5, …), while displaying their choice on screen. However, I did not get this to work online. (Printing keyboard input to the screen)
My current workaround is to redirect participants to qualtrics afterwards and have them provide demographics there.