Apparently it is like this:
.Columns(Function(col As Object) {
col.Field("OrderID").HeaderText("Order ID").IsPrimaryKey(True).TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add(),
col.Field("CustomerID").HeaderText("Customer Name").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add(),
col.Field("OrderDate").HeaderText("Order Date").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add(),
col.Field("ShipCountry").HeaderText("Ship Country").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Left).Add()
})