Never mind, I found the solution on list that we can use \dotfill and \multispan{n}{\dotfill} as a substitute for what I have asked for.

On Sat, Dec 30, 2023 at 2:11 PM Shiv Shankar Dayal <shivshankar.dayal@gmail.com> wrote:

In LaTeX, I can use \hdots for horizontal dots and \hdotsfor{n} to fill for several columns in a determinant. But these do not work in ConTeXt. What is the equivalent for these in ConTeXt?

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Respect,
Shiv Shankar Dayal