Make String Bigger?

I think there should be an option to make a string's area it can display text bigger at runtime (unless there already is in which case show me).

For example, I have a string object made horizontally centered. It's int the bottom left to give instructions to the player while they are playing without distracting them. When the player wins, I want it to get bigger *but since it's centered* I can't have the displayable size bigger to start. Instead of having to make a new string object, I think it would be convenient to have a "Set X size" or something in the actions.

Other objects have this, like the Active Picture. Why not Strings?

EDIT: Ok I've noticed you can change the font size and have the string resize itself to fit. But that doesn't work for what I want to achieve. It makes the string's Y size bigger as well.