T-Engine Metadata extraction & Transform - Retrieve FileName

[Ignis]

Hello, 

I used the new t-engine transformer and metadata extractors to perform custom actions (transform, extract) with a specific mimetypes... They are working perfectly but some custom-external transformation/metadata extractions needs the original filename of uploaded file to perform their job properly.... 

Are there any options to retrieve it? Current Transform interfaces only provide the inputstream and mimetype... 

Maybe are there any options to attach it into transformOptions or metadataextract parameters? Other ideas??

Thanks in advance