You will not be able to interact directly with the data in the dynamic arrays that are created. These arrays are only for the internal use of Dynamic Dropdowns to be used with these behaviors. Any direct interaction with these arrays will be a custom endeavor.
In a standard scenario you would have the dynamic dropdown lists in place and have them filter the selections available based on the selection in the previous menu. Once the selections have been made you can have the values for the selections posted to whatever page is listed in the action of the form.