extending core component data layer

[avitripathy01]

Hi,
Is there a way to extend the core components data layer attributes ? For e.g. currently the Page component has default attributes below.

• @type,
• dc:title
• xdm:language etc.

How could I extend to add more attributes to the page object in the data layer ?
My initial thought was to override the getComponentData() in the sling model using a custom PageDataBuilder wrapping the core component PageDataBuilder but the parent class GenericDataBuilder is not public either.

Any guidance on how to achieve the above requirement?