[NTG-context] Display reference number as Roman number

Hello all, What I thought should be a simple conversion escapes me. I have a reference (created originally via a label defined by \definelabel) that, when referenced as *\in[label]* or *\ref[number][label]* displays a number, and that is how I normally use it. However, I want to display it in one instance as a Roman numeral. *\**Romannumerals{\in[label]}* complains that it is not being fed a number. How can I display the label number in Roman number format in this one instance? -- Rik