Why after adding unix-block device to container, but it not show in lsblk

I create centos7 container lxc launch images:centos/7 test, and create drbd device, I want to pass the block device to the container,
so lxc config device add test drbd2 unix-block source=/dev/drbd2, it will be auto add to the /dev in the container. And it shows in /dev, but why doesn’t it show in lsblk? how to config to make the device could show in the lsblk

lsblk looks at /sys which isn’t container aware, so I don’t know of a way to make that show up properly.