This script imports public SSH keys (files with extension "pub") into
local store for user authentication.
Just install the script:
$ScriptInstallUpdate ssh-keys-import;
Copy files with extension "pub" containing public SSH keys for your device.
Then run the script:
/ system script run ssh-keys-import;
Starting with an authorized_keys file you can split it on a shell:
while read type key name; do echo $type $key $name > $name.pub; done < authorized_keys