I hope I understood properly your request but you can insert a text input instead

Also, you can display either a Label or a Text Input depending on wherever the VAT is empty or not by
1. Inserting a "Label" and "Text Input" component in the same coordinate and with same size.
2. Control visibility with "Visible" property on each component, respectively
Blank(FromProcessor1.Results.TotalVat.Value)
and
Not(Blank(FromProcessor1.Results.TotalVat.Value)