How can I get the following table of contents?

Contents

Chapter first MyTitle

Chapter II MyTitle

Chapter III MyTitle

I have tried:

\MyNumber{\doifelse{\currentsectioncountervalue}{1}{first}{#1}}

setuplist[chapter][numbercommand=\MyNumber]

but it does not work. Actually because \currentsectioncountervalue always returns 0 in the table of contents. So I need another command which gives me the current number for testing if it is equal to one (first chapter).

Thank you in advance.