...
An output field element is a container for text supplied by your 5250 program or by a JavaScript expression.
Changing Labels
...
To add a new label, select Label in the Widgets Toolbox and drag it to the screen. Double-click the label to modify the text, font, color, alignment, and formatting.
Creating a dynamic output field
To create an output field that is evaluated through a dynamic JavaScript expression, enter script: or js: plus the appropriate expression into the value property of the field.