Church Slavic
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This page offers basic guidance on typesetting a LaTeX document in the Church Slavic language using the Cyrillic script.
The churchslavonic package is
not fully compatible with babel, but many of its features work. Just
try.
Support with ini locale file
Here is a minimal sample file with churchslavic as the main language
(assuming luatex, which is the recommended engine, and babel ≥24.14,
although it may work with previous versions).
\documentclass[churchslavic]{article}
\usepackage[provide=*]{babel}
\babelfont{rm}{NewComputerModern10}
\begin{document}
Local name $=$ црькъвьнословѣньскъ ѩзыкъ
Chapter $=$ \chaptername
Today $=$ \today
\end{document}

Contribute
If you are a native speaker or have expertise in this language, you can contribute, make suggestion or request an enhancement by submitting a pull request, opening an issue, or contacting the Babel maintainer with the link above.