I got the below post regarding the property class instance
it looks like there is nothing in the blcli to do this. we can apply the acl to the property class w/ the cli, but not the individual instances.
can you submit a ticket to support asking for this ?
is it possible to set ACL for Individual Instances in 8.5?
blcli_execute PropertyInstance applyAclPolicy "Class://SystemProperty/Class/SubClass/InstanceName" "AclPolicyName"