The add-on is limited to 4.1.0 until they release a new version.
What add-on do you mean?
I'm using HA docker version and the Z-Way (actual 4.12) integration since a long time (after was published) - but in this time only for Z-Wave devices...
About the HAOS add-on didn't know...
So there is the Z-Way Home Assistant integration and then there is the Z-Way Home Assistant add-on. The integration adds the devices from Z-Way into HA. The add-on is actually running Z-Way as a docker on HAOS: https://github.com/Z-Wave-Me/ha-z-wave-me-addon
You can still use the integration but you do not need a separate system for Z-Way.