Creating custom numbering system

[Pandazis Dimakis]

Greetings to all!
I have the need to create a very specific numbering format. I 've been searching all around the Internet, but didn't find anything, even remotely close, to waht I'm looking for.

By default, InDesign has very specific set of numbering formats, numerals, latin numerals and latin letters.
I want to create a numbering system that uses greek letters, not latin.
Does anyone know if this is possible and how?

Keep in mind, I am looking for a permanent solution to this. I am not interested in work-arounds with paragraph and character styles, I already tried most of these. I, even, tried to manage a character-style based, GREP replacing routine, without any success.

Fun-fact: in ancient Greece, there were no numerals, but they used the letters as numbers too.
In many cases, greek writers prefer that style of numbering lists, thus the need for a permanent solution.

Thanks in advance!

Edit:
I must specify something important. I need to have total control of the creation of the numbering system.
That's because, "numbering" with greek letters doesn't correspond to their "numeral" value.
For example, the number 5, is the fifth greek letter "ε", but then, number 6 is an old "ligature" "στ", which is NOT included in modern greek alphabet. So, the 6 letter "ζ" of modern greek alphabet corresponds to number 7.

[Manan Joshi · Accepted solution]

There is no inbuilt solution for this, not do i know if any plugin that could help. Look at the following discussion that talks about a workaround by using custom typeface

https://community.adobe.com/t5/indesign/custom-numbering-style-format/td-p/10412802

-Manan

[Manan Joshi · Accepted solution]

You could post a feature request for this at the following

https://indesign.uservoice.com/forums/601021-adobe-indesign-feature-requests

Search if there is any such request already, if there is then upvote it else create and post the link here so that others in need of this can upvote the feature

-Manan