This file is indexed.

/usr/share/diskimage-builder/elements/grub2/pkg-map is in python-diskimage-builder 1.0.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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{
  "family":{
    "debian":{
      "signed_grub_efi": "grub-efi-amd64-signed",
      "signed_shim_efi": "shim-signed",
      "grub_bios": "grub-pc-bin"
    },
    "redhat":{
      "signed_grub_efi": "efibootmgr grub2-efi-modules grub2-efi",
      "signed_shim_efi": "shim",
      "grub_bios": "grub2"
    }
  },
  "default":{
      "signed_grub_efi": "grub-efi-amd64-signed",
      "signed_shim_efi": "shim-signed",
      "grub_bios": "grub-pc-bin"
  }
}