Add files to group externally before building (Unity Build Cloud)

We now use asset bundles to pack our audio files. We have u build process using Teamcity that does code gens and prepares our projects which does some configuration stuff and also update audio (speech) files and add those to a directory (assets/audio_[locale]). It then pushes this to a git branch and Unity Build Cloud is building the updated project with the update audio files (that are added in the asset bundle).

So my question: Can you do something like this in the Addressable system? So externally add assets (audio files in my case) to a directory within assets that then can be added to the addressable bundle (with the file name as a reference identifier)?

 

Is this not possible?