The variable is fine, it’s a text block reference. This variable is not text, it’s a widget that can hold text data. The default value goes here:
To assign textblock’s text value dynamically, follow @Ryunawa1’s suggestion.
Alternatively, create a text variable and bind it (see pic, on the right). You may also use the Quanitity [sic] integer there. The text block widget will then poll data off that variable.