Well, there is a Rhinoscript method available to get/set the text justification. A script could be made that does this. Note: what’s difficult about this is that the text insertion point does not change. So, when you change the justification, the text will move - sometimes significantly. If the text is justified “bottom left” (default) and you change it to “top right”, the text moves in the opposite direction; that is to say it will move to the left and down.
–Mitch