I would like to use Inventory items (such as Inventory Asset Tag) as part of the key for "External check" item type.

My setup includes servers located on a Cloud provider, and I populate items in the inventory based on the metadata available (examples http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html and https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service).
I would like to use some of these parameters as part of a script stored on the Zabbix server, therefore using an External Check item type.