something like this

\enabletrackers[structures.notes]

\setupnotedefinition[footnote][location=left,distance=1em,hang=4,headalign=flushright]

\startluacode
    local n, ranges, pages = 0, { }, { }
    for k, v in ipairs(structures.lists.collected) do
if v.metadata.kind == "description" and v.metadata.name == "footnote" then
            local realpage = v.references.realpage
            local number = v.numberdata.numbers[1]
            local range = ranges[realpage]
            if not range then
                range = { min = 0, max = 0 }
                ranges[realpage] = range
            end
            if number < range.min then
                range.min = number
            end
            if number > range.max then
                range.max = number
            end
            pages[number] = range
        end
    end
    function document.dosomething()
        n = n + 1
        local range = pages[n]
        if range then
            context.setupnotedefinition(
                { "footnote" },
                {  sample = range.max }
            )
        end
    end
\stopluacode

\appendtoks
    \ctxlua{document.dosomething()}
\to \everybeforenoteinsert

\showframe

\starttext
    \dorecurse {200} {test\footnote{test} }
\stoptext


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