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Do you mean you want to add a field in the configurable list widget and use it for pricing?
You could do this with a text box field in the configurable list widget settings and set a hint for a monetary value as an example.
So inside of the widget settings for the configurable list to create that I have it like this:
If that's not what you meant then please tell us more about what it is you are trying to do so that we can assist you better.