Why BlockDeviceMapping does not create UUID?

Question

In Linux machines, block devices have UUID

Below is the CloudFormation template:

 "BlockDeviceMappings": [
        {
            "DeviceName" : "/dev/sdf",
            "Ebs" : { 
                    "VolumeSize" : "20",
                    "DeleteOnTermination" : true 
                    }
        }
    ],

that creates block device of size 20 GB

but, below command does not show UUID on Amazon Linux instance.

$ lsblk -o +UUID --fs /dev/sdf
NAME    FSTYPE LABEL UUID                                 MOUNTPOINT        UUID
nvme2n1 ext4                                              /ecs/app_home 

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How to make "BlockDeviceMappings" generate UUID for /dev/sdf? Idea is to use that UUID and run mkfs.ext4 -U ${uuid_var}...