Does someone know how to change the font type of game notes into a mono-spaced (non-proportial) font?

In Dark Chess games I trace my opponents pieces by logging a comment like

# 2:

- ABCDEFGH

8 r?b?k??r
7 ????-???
6 ???????-
5 ???-p--?
4 ----P---
3 ---P----
2 PPP-PPPP
1 RNBQKBNR

at the game notes field (which is not visible for the opponent).

Unfortunately the default font type of game notes is a proportinal one, i.e. each character is displayed with an indivial length.

I already tried to enclose my notes into <TT> </TT> and <CODE> </CODE> HTML tags which are usually displayed mono-spaced, but I didn't work: BK seems to ignore or escape these tags ...