Expression assistant for workflow attachment name

I would like to use the Expression Assistant in the Workflow Attachment Name like we can use in the Attachment Folder Path.

Great Idea,
Adding the expression assistant in all “Template” context like box will be really hepfull.

Right now, i build my expression in any available expression assistant then copy-paste and enclosed it with <<>> , it will be time saving

That’s right. But sometimes you need expressions with newlines.
If you want to use a LongText as the file name, you have to remove newlines with an expression like:

SWITCH([LongText_Column], "
", " ")

But newline is not working in the Attachment Name.