an actual page number in, but if that is true, then I have no idea
what the syntax should be … or it could be a case of NIY?
A quick and dirty way to create external page destinations is:
\setupinteraction[state=start]
\setuplayout[top=1sp,topdistance=1sp]
\setuptoptexts[{\contentreference[page
]
\setuptoptexts[text|margin|edge][text|section|date|mark|pagenumber][text|section|date|mark|pagenumber]
\setuptype[options]
\setuptyping[file|typing|name][options]
\setupunderbar[options]
\setupurl[options]
\setupversions[options]
\setupwhitespace[none|small|medium|big|line|fixed|fix|dimension]
# \setvalue
