[NTG-context] special chapter label

[jbf]

Am working on a book where most chapters are simply labeled Chapter One, 
Chapter Two etc., and this has been achieved easily enough with 
\setuplabeltext[chapter=Chapter ]  (also including 
\setupheads[conversion=Words] to get One, Two instead of 1 2).

But several chapter labels need to have a date range after them, e.g. 
*Chapter Three: 1820-1880*.

I have tried introducing a new \setuplabeltext[chapter=Chapter: 
1820-1880 ] just before the \startchapter command, but this results in*:**
*

*Chapter: 1820-1880 Three* (and I also hope that introducing this does 
not also affect Chapter Four since that will have a different set of 
dates).

How can I get a specific labeltext set up so that the result is *Chapter 
Three: 1820-1880*, and also ensure that other chapters either return to 
just the chapter number or, if needs be, can also indicate different 
date ranges? I have looked everywhere on the wiki for ideas to help me, 
but so far no luck.

Julian

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