Custom property editor and using @umbraco-cms/backoffice

Shameless plug, but I think this other issue with Where is the Backoffice UI Documentation? covers your use case as well, where I posted an example:

That will get you the properties on the page, but if you instead want a more generic alias, you could try and consume the UMB_DOCUMENT_WORKSPACE_CONTEXT which has a property for contentTypeUnique that is a GUID of your content type.

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