Multiple Selection Widget: Add option to assign calculation values

Is there a way to assign values to the selections in the widget and compute the price based on the assigned price value for each day (see screenshot)?

Unfortunately, this is not possible to assign calculation values to the items of the widgets. We will let you know if we have any changes on that, but there is no ETA at this time.

You may consider using regular fields (like Dropdown, Single Choice, Multiple Choice) to be able to assign the calculation values.