In order to add labels to Wikidata entities in Arabic dialects using QuickStatements, we have to let them supported by Mediawiki:
* North Levantine Arabic (apc),
* South Levantine Arabic (ajp),
* Gulf Arabic (afb),
* Hejazi Arabic (acw),
* Najdi Arabic (ars),
* Hadhrami Arabic (ayh),
* Sanaani Arabic (ayn),
* Ta'izzi-Adeni Arabic (acq),
* Mesopotamian Arabic (acm),
* Cypriot Arabic (acy),
* Egyptian Arabic (arz),
* Northwest Arabian Arabic (avl),
* Sudanese Arabic (apd),
* Bahrani Arabic (abv),
* Libyan Arabic (ayl),
* Tunisian Arabic (aeb-arab),
* Algerian Arabic (arq),
* Moroccan Arabic (ary),
* Hassaniya Arabic (mea),
* Saharan Arabic (aao),
* Chadian Arabic (shu).
Please let them supported by Mediawiki and if you like to have the native names of these dialects, I can give them to you.
If one or the other language code is needed, it might be worth creating a separate request.