[1.16.4] Language Provider don't support Chinese?

I'm a Chinese modder, and I use language provider to provide the Chinese language file. This is the problem I encountered. The language file provided by LanguageProvider does not display Chinese correctly.

there is my code

public class SCLanguageProvider_en_us extends net.minecraftforge.common.data.LanguageProvider {
    public SCLanguageProvider_en_us(DataGenerator gen, String modid, String locale) {
        super(gen, modid, locale);
    }

    @Override
    protected void addTranslations() {
        add(RegistryItems.REVELATION_SCROLL.get(), "Try English: This is en_us");
        add(RegistryItems.MIND_CRYSTAL.get(), "Try Chinese: 这是中文");
    }
}

and there is the output

{
  "item.saintchapter.mind_crystal": "Try Chinese: \u6769\u6B10\u69F8\u6D93\uE15F\u6783",
  "item.saintchapter.revelation_scroll": "Try English: This is en_us"
}

You can see the Chinese part is output as "\u6769\u6B10\u69F8\u6D93\uE15F\u6783"

😭I am not good at English, I hope my expression is correct.