let
    fruits = Excel.CurrentWorkbook(){[Name="Фрукты"]}[Content],
    city = Excel.CurrentWorkbook(){[Name="Города"]}[Content],
    Beautiful_Join = Table.Join(fruits,{},city,{})
in
    Beautiful_Join

let
    lst = {"a", "b"}, 
    comb = List.Transform({lst, List.Reverse(lst)}, (x) => Text.Combine(x, ", "))
in
    comb

#table(
    {"н-нада"}, 
    List.Combine(
        Table.ToList(
            Source, 
            (x) => List.Transform({x, List.Reverse(x)}, (w) => {Text.Combine(w, ", ")})
        )
    )
)

Table.FromColumns(
    {((x) => List.Transform({x, List.Reverse(x)}, (w) => Text.Combine(w, ", ")))(Source[Данные])} ,
    {"н-нада"}
)

Table.FromRows(
    List.TransformMany(
        Table.ToList(Source, (x) => x),
        (x) => x,
        (x, y) => {Text.Combine(List.Union({{y}, x}), ", ")}
    ),
    {"н-нада"}
)