welcome to scribus.
yes, the scribus does have variable text
the real variable text is not much tested and is probably not working very well yet
on the other side, there are linked scrapbook elements (patterns) that should work correctly.
you have to insert a frame, but you might reach a similar result as you are looking for.
and in the stable version (1.4) there is no other way than repeating the text on each (master) page...
the scrapbook can be of some help there.