Is there a way to use a dropdown to select the Unique Code to force the

Is there a way to use a dropdown to select the Unique Code to force the user to select a value on the spreadsheet? (And maybe avoid the need for the button to be pressed afterwards)

It appears as though the way the widget is loaded into the form it is not possible to pre-populate it with a value.  It would also not be possible to trigger the widget function any way other than actually pressing the button.