When you create data field of type list of booleans it result in the same form field as if it was a simple boolean (but this goes for all types of data fields except of the nested objects). I think this does not respect the different data type character of list/non-list variables.

Also this was working in the old formmodeler and from lists of basic data types was created a widget called "multiple input". Changing priority to critical, because this might be important for some customers on their migration to new forms.