Is there any way to have custom outline numbering in Omni Outliner?

e.g.

-CodeABC-1 [level 1]
--CodeABC-1a [level 2]
--CodeABC-1b
--CodeABC-1c
-CodeABC-2 [level 1]
--CodeABC-2a [level 2]
--CodeABC-2b
---CodeABC-2b(i) [level 3]
---CodeABC-2b(ii)

where "CodeABC" is a string, and "1", "a", "i", follow a level hierarchy.

If Omni Outliner isn't capable of this, I would like to submit this functionality as a feature request.

Thank you.