How to implement Pass-Through Filesystem running HA as Guest in KVM

I run OMV as host and HA as Guest in a VM on KVM. I do have the option to activate a passthrough filesystem on the host. Unfortunately I do not have any idea, how to mount this in the guest HA installation.
Any ideas how to handle this?

I would like to pass my Media Folder to the HA installation to access it via the Sonos Addon.

solved with isolated network and CIFS Share