transition to ZFS

Hello all,

I've a single-node home-based Proxmox machine with 3 active always-on VMs in it and I'm at the point where I'd like to transition the "local" storage volume to ZFS underneath, instead of LVM. the root and swap can exist on a single drive.
I have 3 other storage drives in the LVM at this time.

Has anyone made this transition using only a single node? What folders/files do I need to hold in "limbo" during the transition for it to be mostly seamless once the ZFS array is live?

Looking for suggestions!

Thanks.