Bracket Pair Colorizer. Только активная область.

Bracket Pair Colorizer

Настройки settings.json под тему Material Theme High Contrast

    "workbench.colorTheme": "Material Theme High Contrast",
    "bracketPairColorizer.scopeLineCSS": [
        "borderStyle : solid",
        "borderWidth : 1px",
        "borderColor : LightSkyBlue; opacity: 0.75"
    ],
    "bracketPairColorizer.consecutivePairColors": [
        ["<", "</"],
        ["<", "/>"],        
        "()",
        "[]",
        "{}",
        [],
        "Red"
    ],
    "editor.matchBrackets": false,  

https://github.com/CoenraadS/BracketPair/issues/139