config/sublime/Packages/AAAPackageDev/Snippets/Commands/Commands.sublime-completions

{
    "scope": "source.sublimecommands",

    "completions": [
        { "trigger": "c", "contents": "{ \"caption\": \"$1\", \"command\": \"$2\" }" },
        { "trigger": "i", "contents": "{ \"caption\": \"$1\", \"command\": \"$2\" }" }
    ]
}