/etc/cobbler/pxe/pxesystem_arm.template is in maas-provision-common 2.2.2-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | default linux
prompt 0
timeout 1
label linux
kernel $kernel_path
$append_line
initrd $initrd_path
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