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Unfortunately Stuart, this would not be possible.
The configurable list widget can not take in another widget - the progress bar - to check out the progress on the same. The most that you could do is to either use progress widget: Progress Bar and have it check if the configurable list is filled out or not (not how many things within it, just it as a whole) or alternatively set up your form with many fields that are "being added as needed" by showing them on your form through conditions.
That would allow you to use the widget above and have the progress meter as people fill out fields on your form.