Hi @Claudia_Ramos , welcome to the forum 
Good question! Unfortunately, currently, it is not possible to define Dashboards in Templates 2.0.
The best workaround I use is to use a project as a ‘template’ instead of a using an actual template. You can setup the Dashboard in this project so that once you duplicate the project, make sure you have checked the ‘Dashboard’ option so that it copies over to the new project you set up.
I understand this is not super ideal but it works for most cases.
Ideally you would want this ‘template’ project to have unassigned tasks so they don’t always appear in people’s My Tasks view (which was an issue with Templates 1.0)
Note: Not a solution but marked as such to elevate a key reply