QlikView Script to PowerBI

With MyTable being the table that contains columns Field (text), Resolved (date), and Opened (date):

let
    AddColumnTicketAge = 
        Table.AddColumn(
            MyTable, 
            "Ticket_Age", 
            each 
                Duration.Days(
                    if List.PositionOf({"", Text.Upper("Value1"), Text.Upper("Value2")}, Text.Upper([Field]), 1) > 0
                    then ([Resolved] - [Opened]) 
                    else (Date.From(DateTime.LocalNow()) - [Opened])
                ),
            Int64.Type),
    AddColumnTicketOpenAge = 
        Table.AddColumn(
            AddColumnTicketAge, 
            "Ticket_Open Age", 
            each 
                Duration.Days(
                    if List.PositionOf({"", Text.Upper("Value1"), Text.Upper("Value2")}, Text.Upper([Field]), 1) > 0
                    then null 
                    else (Date.From(DateTime.LocalNow()) - [Opened])), 
                    Int64.Type
                )
in
    AddColumnTicketOpenAge

 The Power Query language is called M (for Meshup), not DAX.