Вот некоторый базовый код, который должен указывать вам правильное направление.
Я прокомментировал это как можно больше.
Sub GetJSONOutput()
Dim wks As Worksheet: Set wks = ActiveSheet
Dim lngLastRow As Long, i As Long, j As Long, k As Long
Dim blFirstRow As Boolean
Dim strOut As String
lngLastRow = wks.Cells.Find("*", wks.Cells(1, 1), , , , xlPrevious).Row
k = 1
For i = 1 To lngLastRow
'\\ First Element - Column A
'\\ Check for first line and build beginning style
If Len(wks.Cells(i, 1).Value) > 0 Then
If blFirstRow = False Then
strOut = "{ """ & wks.Cells(i, 1).Value & """: {"
blFirstRow = True
Else '\\ Rest follow the same style
strOut = "}, """ & wks.Cells(i, 1).Value & """: {"
End If
wks.Cells(k, 4).Value = strOut: k = k + 1 '--> Output Column D
End If
'\\ Middle element - Column B
If Len(wks.Cells(i, 2).Value) > 0 Then strbase = " """ & wks.Cells(i, 2).Value & """: ["
If Len(wks.Cells(i, 3).Value) > 0 Then
'\\ Now we have Middle element then we need to loop through all elements under it!
'\\ Last Element - Column C
If Len(wks.Cells(i + 1, 3).Value) > 0 Then
strAppend = ""
For j = i To wks.Cells(i, 3).End(xlDown).Row
strAppend = strAppend & "|" & wks.Cells(j, 3).Value
Next j
strOut = strbase & """" & Replace(Mid(strAppend, 2, Len(strAppend)), "|", Chr(34) & ", " & Chr(34)) & """]"
wks.Cells(k, 4).Value = strOut: k = k + 1 '--> Output Column D
i = j - 1
Else
strOut = strbase & """" & wks.Cells(i, 3).Value & """]"
wks.Cells(k, 4).Value = strOut: k = k + 1 '--> Output Column D
End If
End If
'\\ Complete output by outputting the last closing brackets
If i = lngLastRow Then
strOut = "}}"
wks.Cells(k, 4).Value = strOut '--> Output Column D
End If
Next i
End Sub