Set the label of a field.
field String (required) - The data name for the field
hidden String,null (required) - The text for the field label, or
null to restore the original label
// Sets the field's label to 'Weather Report' SETLABEL('weather_summary', 'Weather Report')
// Unsets any override previously set by SETLABEL and uses the original setting from the form schema SETLABEL('weather_summary', null)