Avoiding duplicates between base build and asset bundle

Hello

A project I'm working on, I'm doing a size optimization pass and we are using asset bundles. I have read that assets that are referenced from a scene in an asset bundle, that asset will be copied into a the asset bundle anyway. However, in my case, some of the assets are being used in the base built application, and I'm interested in a way for the asset bundle to reference the base asset in the build, without duplicating it into its own bundle.