'SharePoint Online PowerShell PnPNavigationNode Sub-Sub node?

does anyone know how to create a quick-nav sub-sub link using PowerShell?

I am using this code to create the first sub link

Add-PnPNavigationNode -Location QuickLaunch -Header "Reports" -Title "Appointment Plus" -Url "https://mysitehere.com"

but I am not clear how to add a nested link to the "Appointment Plus" node in code. It seems as if a sub-sub link can only be added while in the SharePoint Online UI directly.

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Any ideas or thoughts should be most appreciated!



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