Enable sound in systemd-nspawn container

I've not been able to get how to pass a sound card device to a systemd-nspawn container.

The program I've written and I do use to run the container is calledchroot-shell and I won't post it here because it's too long to do and because it's released under a Stack Exchange incompatible coypleft license.

The relevant sound-related option I've added up so far to the

call is

and moments before opening this

I will test it at next reboot.

I'd like to just know which options I have to add to the systemd-nspawn call so that the command can work as an effective systemd-compatible chroot for most users.