On 12/6/2022 9:06 PM, Rik Kabel via ntg-context wrote:
\definelabel[X][text=]
\startTEXpage[offset=1cm]
   \X\X[a]\X[b]\X\par
   \convertnumber{R}{\ref[number][a]}
   \convertnumber{G}{\ref[number][b]}
\stopTEXpage

maybe like this:

\definelabel[X][text=]

\startTEXpage[offset=1cm]
  (\X)
  (\X[a])
  (\X[b])
  (\X)
  \par
  \doifelsereferencefound {a}
    {\convertnumber{number}{\currentreferencenumber}}
    {}
  \par
  \doifelsereferencefound {a}
    {\convertnumber{R}{\currentreferencenumber}}
    {}
  \par
  \doifelsereferencefound {b}
    {\convertnumber{G}{\currentreferencenumber}}
    {}
\stopTEXpage

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