Transform blocks of rows into table

If the rows will always be in groups of four, you can

• Add an index column where each group of rows has an assigned number
  • Without this unique identifier for each block, the Pivot with no aggregation will error
• Pivot on Column 1 with Column2 values and no aggregation

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8kvMTVXSUXJ0dFSK1YlWcs1NzMwB8lNBtKFDcn5uQWJepR6QBks7poMUGxuAOSGZJTkgbnAikAIJQM1ycnLCNMsIh1lGpihmeYYgm+Ts7IxpkjEuVxmimOSbmJeYnlqkFBsLAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t, Column2 = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Column1", type text}, {"Column2", type text}}),

    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Integer-Divided Column" = Table.TransformColumns(#"Added Index", {{"Index", each Number.IntegerDivide(_, 4), Int64.Type}}),

    #"Pivoted Column" = Table.Pivot(#"Integer-Divided Column", List.Distinct(#"Integer-Divided Column"[Column1]), "Column1", "Column2"),
    #"Removed Columns" = Table.RemoveColumns(#"Pivoted Column",{"Index"})
in
    #"Removed Columns"

The above code assumes each block has four rows.  If the numbers of rows might vary, but, for example, the first row is always "Name", then you can still assign a unique number to each block with the code below, and then do your pivot as before.

    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each if [Column1] = "Name" then [Index] else null),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Index"}),
    #"Filled Down" = Table.FillDown(#"Removed Columns",{"Custom"}),