We have "contentCreated" to depict when the content was originally created - e.g. on film
We have "firstCreated" to depict when the first version of the news item was created
We have "versionCreated" to depict when the version of the news item was created

These fields do not allow us to convey the date / time an analogue asset was digitised. This information is useful for archival imagery be it still or video.