[Adobe Mobile Services] Postbacks - expose the advertising id (Google / Apple)

Hello!

for business requirements, we need to send the advertising ID (Google's ADID or Apple's IDFA) to a 3rd party API. We've noticed though that in the context variables there is no mention about this information.

Is it perhaps a "hidden" context variable we can use, or it's not available at all? Would it be possible to expose it without needing to change the applications' source code?

Thank you