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

[KonradStanski]

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

It is spelled barckets