Forms with auto size text - cross post from beginner

[Nicanor]

Hi,

I'm looking to make text in a text form field scale based on how much text is typed in. This is available in acrobat pro by entering the text size as 0. However in Scribus setting the font to 0 or typing in "auto" defaults to a very small text size.

Does anyone know how to set the text to autoscale?