Found the solution. Had to create an offset variable containing the height of the text/2, then position equals x,y-offset on the position attribute of the text layer, so the text is always vertically aligned (I'm wondering why AE doesn't comes with this feature in the Paragraph section, seems pretty useful).
Hey Sergio, the text layer most likely has paragraph setting set to a center. Change it to left instead.
Lets call your images 1,2,3,4.
However, what you won't achieve with this setup - it is impossible to have text like '1' and then expect that '3' will be aligned to a left side.
Also, your 4th image is with a lot more characters inside the text area than others. If by this example you mean that each line should have equal width, then different approach is required instead of using text area tool.