As an aside this is what I did if anyone is curious:
host (needs a powerdown to take effect) :
mkdir /tmp/share
qm set 106 -args "-fsdev local,security_model=passthrough,id=fsdev0,path=/tmp/share -device virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=hostshare"
guest:
mkdir /mnt/folder
mount -t...