WebADI and DLP (Data Loss Prevention)

Hello, community.

Is there a way to add custom properties to a Excel WebADI-generated file?

The customer wants to apply DLP to those files (to avoid sending them to recipients outside of corporation's domain) and, as far as I know, this can only be achievable by setting these properties in the files.

By a property, I mean a document internal xml property (like author, title, document version, creation date and so on).

Marcelo Cavalcante.