How to set zpool name on manual partition?

I wanted to shrink the efi ( I think 260MB is too large), so I used manual partition. I wanted to set the zpool name "zroot" and set the Label "zroot" when creating freebsd-zfs. But the pool name is "root". I wanted to change it to "zroot" because the default of AutoZFS is zroot. I have searched online and used zpool export, but not working.
 
Is there any problems with "root" pool name? Many tutorials in handbook use zroot. And if using AutoZFS, there will be a /zroot directory, what's the function? Honestly, I don't know any of these.
 
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