That means: 1->"a", 2->"b", 3->"c", ... , 26->"z", 27->"aa", etc, just like spreadsheet horizontal cell indexing?
I looked for it in the documentation, but I couldn't find it. If it doesn't exist, I'll just make it myself, but I like to use engine functionality as much as possible.
PS:
Roman numerals would work for me too, I just need something other than numbers to distinguish two systems in my game.