Add column with filename to final table

Hi,

I've following workspace:

"PDF Parser" --> "Document Data Extractor" --> "Java Snippet (simple)" [I extract the filename of the pdf-document" --> "Column Filter" --> Some Preprocessing Nodes --> "Dict Replacer" --> "Keygraph keyword extractor" --> "CSV Writer"

My problem is that the Preprocessing Nodes "delete" the document-name (also some of them only allow one column as input). The result of the "Keygraph keyword extractor" node is follwing table:

Is there any possibility to add a column to the table which contains the extracted file-name? (I extracted this file-name before in the Java Snippet node) The number of keywords may vary, so an adjustable solution would be cool.

Many thanks in advance!

Best

Simon