ZFS How to un-ZFS-ify a drive?

I put ZFS on a microSD card to try s.th. out (keylocation file to prompt). Worked as hoped for.

How does one remove ZFS from the drive again? So that gpart shows the device and I can dd an OS image onto it?

Actually, I find it confusing that a ZFS drive goes under the radar of gpart.
 
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