I thought about this span thing but I didn't know at all how to use it in Construct 2.
But yeah if you say that it's rendered in the canvas I guess it's even more complicated.
But I'd really love to be able to do that !
Maybe I could a plugin like multiline textbox but I guess that if it's not rendered in the canvas I won't be able to paste its data into the canvas plugin, which is something I need to do too.