ZFS How to install a ZFS based system using an existing system

How would I go about installing a zfs based system on a different partition using an existing system?

Do I first add a freebsd-zfs partition?

I want to install it manually. I'm hoping I will be able to boot via Ventoy.
 
I just used the installer and manually created a ZFS partition, worked for me.
Downside: I is only one zpool and boot environments do not work.
 
How would I go about installing a zfs based system on a different partition using an existing system?

Do I first add a freebsd-zfs partition?

I want to install it manually. I'm hoping I will be able to boot via Ventoy.

Don't know if this could help. It's how I dual boot 14 and 15 on an old laptop with UEFI and zfs.

/grandpa
 
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