Power Query - automatically change type of data inside the column (columns have changing titles)

Dear All, I am trying to develop file that will import data from another Excel file. The table that will be imported is similar to table from below. The problem that I have is how to make my q...

excel

SergeiBaklan

Jan 03, 2022

Carminol

To change #1 and #3 on text and rest on whole number

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    columnNames = Table.ColumnNames( Source ),
    changeType = Table.TransformColumnTypes(
        Source,
        List.Transform(
            columnNames,
            each
                if  List.PositionOf(columnNames, _) = 0 or
                    List.PositionOf(columnNames, _) = 2
                then {_, type text}
                else {_, Int64.Type}
        )
    )
in
    changeType

Names of columns and their number don't matter.

PQ change type.xlsx16 KB