I just found
and I really welcome that function.
Over the years (I found threads from 2005, 2007, 2012) there have been requests for this function.
And now it is there.
You find it in the Edit menu as "Copy as text ..." which opens a dialogue in which you can enter a format string very similar to Convert>Tag-Filename.
Perhaps an entry in the right-click context menu of the file list would make the function even more accessible (hint, hint).
And while I am at it:
A checkbox to select all columns from the file list as output for the clipboard would be a nice enhancement ... plus perhaps an input box to define the field separator like dash, slash, underscore, tab character etc..