vue2-grammar/language-configuration.json

{
    "comments": {
        // symbol used for single line comment. Remove this entry if your language does not support line comments
        // used here to allow quick commenting/uncommenting of lines.
        "lineComment": "!",
    },
    // This works nicely.
    "folding": {
        "markers": {
            "start": "^#BEGIN_COMP",
            "end": "^#END_COMP"
        }
    },
    // This is mostly for show.
    "autoClosingPairs": [
        ["#BEGIN_COMP SC", "\n#END_COMP SC"],
        ["#BEGIN_COMP IH", "\n#END_COMP IH"],
        ["#BEGIN_COMP GM", "\n#END_COMP GM"],
    ],
}