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Integrating safety and security in automotive cyber-physical systems (CPS) domains (e.g. autonomous vehicles), is challenging for two main reasons. First, it is still difficult to represent the potential consequences of system failures or malicious attacks. Secondly, these systems must ensure safety and security despite unknowns and uncertainties. A Digital Dependability Identity (DDI) can facilitate this by encapsulating all dependability characteristics (e.g., design, requirements, safety, and security analysis models) of CPS's components. The Open Dependability Exchange (ODE) metamodel is an implementation of the DDI concept, but has limitations in the interplay between safety and security. ODE is aligned with with ISO 26262 but lacks certain security concepts to be aligned with ISO 21434. Also, ODE supports modeling fault trees, but modeling attack trees and attack-fault trees still not. This paper proposes an extension to the ODE metamodel, aiming to increase coverage of ISO 21434 concepts and allowing the modeling of attack-fault trees. We built these metamodel extensions based on an analysis of the ODE metamodel, industry standards, Microsoft STRIDE model, and HEAVENS security analysis methodologies. We evaluated the proposed extensions in an illustrative example of an autonomous vehicle.