Good day to you,
Query #1: can I use a template with a ListBox
We would like to inform that you can use template property in Listbox and we have already documented your reported requirement. Please refer the below documentation link for achieving your requirement.
Query #2: Benefit of Listbox:
The ListBox component is a form component which displays a list of items from which the user can select one or more items. The supported features are data binding, drag and drop, templating, grouping, sorting and filtering.
Query #3- Listview template file.
We have checked your reported query about listview.template file. You can refer the sample browser sample in below location (listview.template file)
We will add this file in our online sample browser on upcoming Volume 4 Release.
Please let us know, if you have any concerns