app creator express change text input

I have recently create an app using app creator express, it works great however would like to change the text input to "Textarea" (As i need need multiple lines) , i found a selection where the component can be change "Custom components - widgetstring". however when change, the custom field with the value: {{FieldValue}} disappears. Does you have any suggestion for change?
Or to put it simple how do I make the text field bigger and multiple lines?
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