Line breaks don't work in Text Box (Multi-Line)

Hi there. I think this is a very basic functionality for this kind of function that doesn’t seem to be working.
Is it possible to feed your text string something like /n or <br> to decide where you want a line break? I mean, the Text Box isn’t called “Multi-Line” for nothing. I tired both of those things and it doesn’t seem to work right.
Checking the option “Auto-wrap” seems to resize the box into a multiple-lined text, but it adds the line breaks automatically, which isn’t the best.