Is there such thing as an extensible or upgradeable cochlear implant? My understanding as a layman in audiology is that the silia or tiny hairs are essentially

Is there such thing as an extensible or upgradeable cochlear implant? My understanding as a layman in audiology is that the silia or tiny hairs are essentially emulated or designed manually at specific frequence-reverberations and this results in some quantifiable Resolution of Hearing. My question is, is there a way or maybe a hardware technique where we could, as equipment improves and nano-scale is reached, add more "hairs" to the board? If not, can someone please make?