I managed to find out that I need to use the hook footballpool_print_bonus_question_template and it seems that the parameter is %admin_answer%, but this one is just empty while the corresponding %user_answer% displays the label “my answer” plus the value (by the way: is there any way to translate or tweak that “my answer”? Only way I found is changing it right in the original plugin source code, which obviously isn’t best practice).
I’ll keep trying!