掲示板 Forums - showing kanjis for kana words

as in the dictionary entry, the "(Rarely written as: 溜まる)" should be showed after the correct answer is given.
I know in the settings there is the option "Show kanji for common hiragana terms", but that would be taking it too far because it would quiz me on この asking me about 此の for example, and that would make fall dawn a huge ammount of vocabs on my SRS because I don't know most of the kanjis for "usually kana" words.
But giving this side note "(Rarely written as: XXX)" after the correct answer is given, would be a really helpful study aid