How to exclude certain ZFS pool/device to auto mount at Linux system boot?

My attempt:

sudo nano /etc/default/zfs

Code:
# ZoL userland configuration.

# NOTE: This file is intended for sysv init and initramfs.
# Changing some of these settings may not make any difference on
# systemd-based setup, e.g. setting ZFS_MOUNT=no will not prevent systemd
# from launching zfs-mount.service during boot.

...

# List of pools that should NOT be imported at boot
# when ZPOOL_IMPORT_ALL_VISIBLE is 'yes'.
# This is a space separated list.
#ZFS_POOL_EXCEPTIONS="mypoolname"