Hi,
I created a pull request to add ajp (South Levantine Arabic) to the list of languages: https://github.com/wikimedia/language-data/pull/165
I did this based on advice from the Moroccan community (ary, another language from the Arabic macrolanguage family) who created a similar task in November 2019: T237672
There's an ongoing discussion on the English Wikipedia about the problem of font and directionality for Levantine Arabic.
Please let me know if there's anything else to do.