Lxd init and LUKS

trying to wrap my head around how to do a FDE LUKS install on a software mirrored 2 x HDD setup where the pool for the containers would get its own partition.
/dev/sda1 boot
/dev/sda2 root on LUKS / (LVM)
/dev/sda3 zfs on LUKS

Isn’t the lxd init going to fully take over that partition and leave it unencrypted?
Any hints appreciated and i would like to note that a pure zfs fde scares me right now.