PowerShell PnP Quick Links

Is it possible to edit the items in an existing Quick Links web part using PowerShell PnP? I have seen posts about using the SharePoint workbench to get the JSON required to create a new web part. However, I want to add or remove items from an existing web part.

I tried using Get-PnPClientSideComponent to get the PropertiesJSON but this doesn't appear to include the full JSON that the workbench produces. So there isn't an items collection to work with (although I admit I might be missing something).

Any thoughts or help would be appreciated.