Any idea for achieving this behaviour?

- When there is a chapter label (\setuplabeltext[chapter=CHAPTER~]), display
:

CHAPTER ONE Cool
CHAPTER 2 Cat
CHAPTER 3 Mouse
etc.

- When there is no chapter label (\setuplabeltext[chapter=]), display:

1 Cool
2 Cat
3 Mouse
etc.


My try achieves the first display, but not the second one since I don’t
know how to test the emptyness of the chapter label. When I remove the
chapter label, it displays:

ONE Cool
2 Cat
3 Mouse

 instead of:

1 Cool
2 Cat
3 Mouse


My code:

\setuplabeltext[chapter=CHAPTER~]
\define[1] \MyCommand{\doifelse{\currentsectioncountervalue}{1}{ONE}{#1}}
\setuphead[chapter][deepnumbercommand=\MyCommand]

\starttext

\chapter{Cool}
\chapter{Cat}
\chapter{Mouse}

\stoptext