Gesture is a program that translates linux touchscreen events into terminal character codes. Details can and will be found in the code.
Included here is a video demo of postmarketOS + gesture + shelli where I login to the linux fbcon (framebuffer console tty), run neofetch and then write the letters and numbers as well as some symbols. In this case gesture and shelli were built and installed locally on the phone. Packaging is a todo.
Graphical representation of how to draw the default gestures in gesture.conf is also a todo.