The serial API for 700 Series has not been publicly released. zwavejs2mqtt supports 700 Series controllers and works with OH through MQTT.
It would be great is somebody could work with their seam to get a WebSockets integration similar to what they currently do with Home Assistant. That would provide a Z-Wave addon that is updated independently of OH.
I personally just worked with their team to correct one of my devices in their database and later ( just before 3.1.0) backported it to the OH binding.