[NTG-context] Text to be placed into the free space after columns and end of the page

[context at vivaldi.net]

Hello,

suppose the minimal example:

----
\showboxes
\starttext
   \startcolumns[n=2,balance=no,]
     \input knuth
   \stopcolumns
   \vfill
   abcd
\stoptext
----

This produces two page document with columns on the first page and text 
"abcd" on the second.

But - I want the text "abcd" to be placed to the bottom of the same page 
as columns are (thus I attempted to put \vfill into the code, but it 
doesn't work), so to get one page document looking like:

+------ page width -----+
Column text | (unused)
column text |
column text |
column text |
column text |
column text |

(some vertical space)

abcd
+----- end of page -----+

- How to achieve this?

Best regards,

Lukas
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