I am attempting to get a TOC that looks like the following (in other 
words with section titles and their relative page numbers in a block 
below the chapter):

Chapter 1 ...................................................5

Section 1   5, Section 2  6, Section 3  7,

Section 4   8, Section 5   9 etc

Chapter 2 ................................................10

Section 1   10, Section 2  11, Section 3  12,

Section 4   13, Section 5   14 etc

As I really had no idea how to do this, I found 
https://wiki.contextgarden.net/Horizontal_Table_of_Contents thinking it 
might help, but none of it compiles (for me) in LMTX. So I tried 
something different, e.g.

\definelist[chapter]

\setuplist[chapter][label=yes,distance=1.5cm,alternative=c,style=normal,before=\blank] 


\definelist[section]

\setuplist[section] [textcommand=\setups{SecToc}]

\setupcombinedlist

[content]o

[list={chapter,section}]


\startsetups [SecToc]

\startframedtext [width=\textwidth, align=middle, frame=off]

\placelist [section]

[

criterium=chapter,

]

\stopframedtext

\stopsetups

While that produces a result, it is nothing like what I want above. Has 
anyone put together a TOC of this kind and might be able to give me a 
hint to follow?

Julian