You999

ZFS not have access to smart only works up until a drive starts acting up. Without SMART ZFS can't accurately determine if a drive is failing and lock the pool in order to prevent further data loss.

The best way to do this is to run a truenas VM within proxmox and passthrough your HBA into the truenas VM. That will give truenas full control over any drive connected to that HBA. The performance overhead isn't that much so don't worry about it.