DSM Node Help Required

I have tried Paul-Reed's Node-Red on a Pi backup flow, which works well. However, I would like to use it on several Pis so I want to amend the save filename to include an identifier. At the moment I am using a Change Node after the DSM Node to edit the filename but I would prefer to add this data from the Inject Node.

Is there any way of sending the DSM Node information that it can use as part of its output?

[edited by @cymplecy to add context to the question node-RED Backup Flow [/edit]

I've already linked the node author into the thread node-RED Backup Flow to comment about the question which you raised there.
This post duplicates the question.
Let's please keep this question in one thread, and give the node author chance to respond!