We don't have best choice for Code syntax.

[takuya_miyai]

Hi @Michelle 

Since this is the AppSheet Community, I think it is best to have the option of AppSheet Expression.😎

I tried a few choices, so JSON might be about right.

[Michelle]

Hello @takuya_miyai,

I am tracking this request.   Thank you for continuing to share your ideas on how to enhance the community experience.

Regards,

Michelle | Community Manager