Choose Table Columns LAMBDA Function

CHOOSETABLECOLUMNS.lambda

/*
Name: Choose Table Columns (CHOOSETABLECOLUMNS)
Description: Similar to CHOOSECOLUMNS but can accept an array of column header names or 
   array of column indexes.  If column headers are used, assumes first row of Table is
   header row.
Author: Excel Robot (@ExcelRobot)
Category: Table
*/
CHOOSETABLECOLUMNS = LAMBDA(Table, ColumnsToSelect, LET(
    FirstColumnToSelect, INDEX(ColumnsToSelect,1,1), 
    ColumnIndexes, IF(
        AND(ISNUMBER(FirstColumnToSelect),IFERROR(AND(FirstColumnToSelect>0,FirstColumnToSelect<=COLUMNS(Table),TRUNC(FirstColumnToSelect)=FirstColumnToSelect),
        FALSE)),
        ColumnsToSelect,
        MATCH(ColumnsToSelect,INDEX(Table,1,),0)), 
    SelectedColumns, INDEX(Table,SEQUENCE(ROWS(Table)),ColumnIndexes), 
    SelectedColumns
));