I've had a look around but haven't found anything too similar.
Using a custom information type I can pick up a string in a document's meta-data e.g. the template value or a custom entry I add to a document. Testing the SIT after configuration, it works as expected.
I've noticed that by adding in this SIT into my policies for client-side auto-labelling or service-based automated labelling the label isn't applied as expected. If I add the value into the document, it triggers as expected.
Curious to see if anyone else has given this ago?
I expect a trainable classifier will work, however looking to see if this is a workaround for the moment. I'm guessing people may be using this when porting over other systems that might be writing meta-data into the documents.