The LaTeX package unicode-math has an option colon=literal, which makes it
behave as in math functions (as in example below). Has ConTeXt a similar
option?
---- lualatex ----
\documentclass[leqno]{article}
\usepackage[colon=literal]{unicode-math}
\begin{document}
The function $f: A → B$.
\end{document}
--------
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