@ruicarvalho_de I don't think we have a direct way to fetch the owner of the dashboard through API. 

We can try using an API call to retrieve the dashboard IDs and then use the following API call /api/2.0/permissions/{workspace_object_type}/{workspace_object_id} to get the object permissions. However, it still will not provide a single, authoritative “owner” field; instead, you only get all principals and their permission levels on each dashboard.