Thank you so much Alan, that was exactly what I was looking for.

Le ven. 20 janv. 2023 à 01:56, Alan Braslau <alan.braslau@icloud.com> a écrit :
On Thu, 19 Jan 2023 22:40:13 +0100
Alexandre Christe via ntg-context <ntg-context@ntg.nl> wrote:

> def labelT(expr pos)(text t) =
> ...
> enddef;

vardef labelT@#(text t) =
    ...
enddef ;

Then you can pass on the "suffix" @#

Alan