On visual studio marketplace, there is a major typo in sample code.

"subtleBarckets.pairs" : [
  {
    "open": "(",
    "close": ")",
    "parse": false
  },
  {
    "open": "[",
    "close": "]"
  },
  {
    "open": "{",
    "close": "}",
    "style": { "borderColor": "red" }
  }
]


It is spelled barckets