Thank you for your reply.
So far, I have this:
local listbox = fe.add_listbox( x, y, w, h );
listbox.charsize = 25;
listbox.align = Align.Left;
listbox.format_string = "[ListEntry]";
But I don't understand how to do what you said. Could you please give me an example? perhaps for 01 or 00001?