Add Japanese phonetic readings for group names in the Personal Address Book

In the group view of the Personal Address Book (when using the Japanese template), the tab navigator does not function correctly for Japanese group names. Although the tab navigator's headings are displayed in Japanese phonetic characters (e.g., for 'あ[A]', 'か[Ka]', 'さ[Sa]' sections), group documents lack a phonetic reading field. Consequently, groups with names in Kanji are not sorted or displayed under the correct phonetic tabs.

This works correctly for group names written in Katakana.

For example, groups named 'ダイハツ(Daihatsu)' and 'トヨタ(Toyota)' correctly appear under the 'た(Ta)' tab. (See 2_Toyota.png)

However, it does not work for group names written in Kanji.

For example, a group named '日産(Nissan)' (phonetic reading: にっさん) should appear under the 'な(Na)' tab, but it is not displayed there. (See 3_Nissan.png)

Please add a 'Phonetic Reading' (よみ仮名- Yomigana) field to group documents, similar to the 'Phonetic Reading' field available for Company Names in Notes 9 Contacts. This would allow the tab navigator to function correctly for all Japanese group names.