It doesn't appear to be possible using the list numbers. You can type a TAB character (CTRL+TAB) in the dialog, but it is not translated to the result - see illustration:
You can do it with SEQ fields e.g.
{ SEQ Num # "'['#'] ['" }
but SEQ fields don't update automatically if you change the order. You must force an update (CTRL+A, F9 or with a macro such as the example at http://www.gmayor.com/installing_macro.htm).