We use this functionality to add helpful scripts for our Desktop Techs to run if needed in OOBE if they encounter issues during Autopilot or Provisioning. Here is an example of that the installs the 'Autopilot Diagnostics Community' script. We typically write these to the OSDCloud folder on C: root for easier access.
if (Test-Path 'C:\OSDCloud\') {
#AP.ps1 - Community Autopilot Diagnostics Script
$PSCodeAp = '
Set-PSRepository -Name PSGallery -InstallationPolicy Trusted -Verbose
Install-Script -Name Get-AutopilotDiagnosticsCommunity -Verbose
Get-Module Microsoft.Graph.Intune -Verbose
Get-AutopilotDiagnosticsCommunity -Online -Verbose
'
New-Item -Path 'C:\OSDCloud\' -Name Ap.ps1 -Value "$PSCodeAp" -Force
}