Ability to overwrite content items via content import

We have a use case for importing content items using the content import feature, in various statuses/stages, e.g., new, planned, complete, etc. We would like to upload a new version of our content items using the content import feature that overwrites the original version and updates the existing record. Instead, a new record is created every time we complete a content import, even if it is intended to be a new version of an existing content item. Then we end up with duplicate entries for the same content item. If this overwrite functionality existed, it would make our experience in Divvy much better.