I'd like to ask for a feature for a user to define a letter sequence that is used in numbered lists.

I'd like to create a document in Ukrainian, and apparently there's no way to number the list with Ukrainian letters (а, б, в…). There are Russian and Bulgarian letters available, but those are obviously different from what I need.

There are state-wide requirements for official documents that regulate how lists must be numbered, and I couldn't find a way to implement that.

Ukrainian alphabet is: абвгґдеєжзиіїйклмнопрстуфхцчшщьюя
And what I want to use as a sequence is: абвгдежиклмнпрстуфхцшщюя (without Ґ, Є, З, І, Ї, Й, О, Ч, Ь as those can be confused with other letters or numbers).