sysinfo prints more values in the json output than it does in the parseable output.
[root@buglets ~]# sysinfo -p | grep -i zpool
[root@buglets ~]# sysinfo | grep -i zpool
"Zpool": "zones",
"Zpool Disks": "c2t2d0",
"Zpool Profile": "striped",
"Zpool Creation": 1545864096,
"Zpool Size in GiB": 72,
[root@buglets ~]#