There is no direct option to limit the user-typed input, but you could go round by adding a text object with a warning message and
show condition like: sum(all if(not match(MyInputField, ListOfAllowedValues), 1) > 0.
You could also consider creating a macro to fill the inputfield based on a variable value. User would select a value from drop-down inputbox and press the button to fill the cells.
