Snippet in AL

Hello Experts,

I am trying to develop a snippet for my AL development. I have written code like below. 

1) My snippet is missing the braces {}.

2) I am not able to get this using "t"

3) I also want to add DataClassification and caption properties.

Can I get some tips to fix this? I am not sure what I am missing in this.

// Example:


"prefix": "dev",
"body": ["field(id;MyDecField;decimal)"],
"description": "Snippet for decimal field"