Post #255:  command line , when pressed , user can write what text to display on screen
Yes, it’s possible. You can use this code in Command tab:
O.pme.overlay(text="Hello World")
But if you want to use it with some other action, for example scale object:
bpy.ops.transform.resize()
you have to modify it’s code (add ‘INVOKE_DEFAULT’, True):
O.pme.overlay(text="Hello World"); bpy.ops.transform.resize('INVOKE_DEFAULT', True)