Localisation for Eastern Cham language

The Eastern Cham test-wikipedia (incubator:Wp/cjm) is written in the latin script. Should translatewiki use another script?

Iirc, there's only one ISO 15924 for Cham script (just "cham").

Not my question. My question was whether to use latn or cham as script for the language.

I'm asking the main contributor to the test-wiki his opinion.