This is experimental in upcoming beta:
\starttext
\definemathfence [fancybracket] [bracket] [command=yes,color=blue]
test $|x|$ test \par
test $||x||$ test (replaced) \par
test $a\left|\frac{1}{b}\right|c$ test \par
test $a\left||\frac{1}{b}\right||c$ test (kept) \par
\startbuffer
test $a\fenced[bar]{\frac{1}{b}}c$ test \par
test $a\fenced[doublebar]{\frac{1}{b}}c$ test \par
test $a\fenced[bracket]{\frac{1}{b}}c$ test \par
test $a\fancybracket{\frac{1}{b}}c$ test \par
\stopbuffer
\getbuffer \setupmathfences [color=red] \getbuffer
\stoptext
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