How to resize a zfs partition on a FreeBSD 14.1 guest

I have a FreeBSD 14.1 running as a guest on proxmox 8.2.3.
I have increased the disk size from 150 GB to 400 GB using the GUI of proxmox.
But how do I add the new space to the VM disk (which uses the ZFS file system)???

root@glas:~ # lsblk
DEVICE MAJ:MIN SIZE TYPE LABEL MOUNT
ada0 0:87 400G GPT - -
ada0p1 0:88 512K freebsd-boot gpt/gptboot0 -
<FREE> -:-...

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