I would like to access some specific out of the box attributes in the Data Warehouse but they are not available.
Attributes that are not included in the Data Warehouse by default cannot be accessed from the DWH.
This can be reviewed in Administration > Studio > Objects > [object] > [attribute] > Include in the Data Warehouse. If this value is disabled, meaning the checkbox is grayed out, then the attribute is not included and it cannot be included in the DWH.