Add root_device_name to amazon ami data source output

Hi,

I need to extend the size of the root device and operating systems have different root block device name(Amazon Linux: `/dev/xvda`, Centos7: `/dev/sda1`) and I would like to avoid hardcoding the device names. I am currently migrating to HCL templates and noticed that there is an ami data source in the packer.

Is it possible to extend Amazon AMI Data Source with root_device_name output? Similar to AWS provider data source: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/ami#root_device_name