Thanks guys,
this worked well.
Just to share back for those that are running HASS.IO on linux systems, the \share folder mentioned will be in the root of your configuration, for example on my system I have \srv\docker\hassio configured.
Inside this folder, you will find, for example the folders
damian@Jarvis:/srv/docker/hassio$ ls -al
total 72
drwxr-xr-x 9 root root 4096 Mar 26 17:21 .
drwxr-xr-x 5 root root 4096 Mar 20 21:48 ..
drwxr-xr-x 6 root root 4096 Mar 19 22:44 addons
-rw-r--r-- 1 root root 5060 Mar 20 22:02 addons.json
drwxr-xr-x 2 root root 4096 Mar 18 17:37 backup
-rw-r--r-- 1 root root 170 Mar 26 17:17 config.json
drwxr-xr-x 9 root root 4096 Mar 26 17:21 .git
-rw-r--r-- 1 root root 2839 Mar 20 12:32 .gitattributes
-rw-r--r-- 1 root root 393 Mar 26 16:04 .gitignore
-rw-r--r-- 1 root root 121 Mar 26 17:21 .gitmodules
drwxr-xr-x 7 root root 4096 Mar 26 17:24 homeassistant
-rw-r--r-- 1 root root 156 Mar 26 17:17 homeassistant.json
drwxr-xr-x 3 root root 4096 Mar 26 17:21 share
drwxr-xr-x 2 root root 4096 Mar 18 17:37 ssl
drwxr-xr-x 2 root root 4096 Mar 18 17:37 tmp
-rw-r--r-- 1 root root 74 Mar 26 17:17 updater.json
I work mainly from the folder which is called homeassistant (go figure), and have initialized a GIT repo at the root, as you can see above from the hidden folder .git
Therefore to add the OpenZwave Dev branch, I am opting to use tha Git Submodule, which is to be hosted in the share folder, with the following command
sudo git submodule add -f -b Dev https://github.com/OpenZWave/open-zwave.git ../share/open-zwave
Which results in the following
damian@Jarvis:/srv/docker/hassio/share/open-zwave/config$ ls euro*
eur_cometz.xml eur_spiritz.xml eur_stellaz.xml
Now, from here I just update my configuration.yaml with the reference as suggested by @rsokolowski
zwave:
usb_path: /dev/ttyACM0
network_key: !secret zwave_secure
config_path: /share/open-zwave/config
debug: false
And from this point, you should have all you need; Eject the TRV, restart the HASS.IO container, and Import the TRV 
thank you @rsokolowski for figuring it out
Damian