My Carbon config for Dart code.

carbon-width-80

{
    "paddingVertical": "0px",
    "paddingHorizontal": "0px",
    "backgroundImage": null,
    "backgroundImageSelection": null,
    "backgroundMode": "color",
    "backgroundColor": "rgba(171, 184, 195, 1)",
    "dropShadow": false,
    "dropShadowOffsetY": "20px",
    "dropShadowBlurRadius": "68px",
    "theme": "vscode",
    "windowTheme": "sharp",
    "language": "dart",
    "fontFamily": "JetBrains Mono",
    "fontSize": "14px",
    "lineHeight": "133%",
    "windowControls": false,
    "widthAdjustment": false,
    "lineNumbers": false,
    "firstLineNumber": 1,
    "exportSize": "4x",
    "watermark": false,
    "squaredImage": false,
    "hiddenCharacters": false,
    "name": "",
    "width": 695,
    "highlights": null
}

carbon-width-auto.json

{
    "paddingVertical": "0px",
    "paddingHorizontal": "0px",
    "backgroundImage": null,
    "backgroundImageSelection": null,
    "backgroundMode": "color",
    "backgroundColor": "rgba(171, 184, 195, 1)",
    "dropShadow": false,
    "dropShadowOffsetY": "20px",
    "dropShadowBlurRadius": "68px",
    "theme": "vscode",
    "windowTheme": "sharp",
    "language": "dart",
    "fontFamily": "JetBrains Mono",
    "fontSize": "14px",
    "lineHeight": "133%",
    "windowControls": false,
    "widthAdjustment": true,
    "lineNumbers": false,
    "firstLineNumber": 1,
    "exportSize": "4x",
    "watermark": false,
    "squaredImage": false,
    "hiddenCharacters": false,
    "name": "",
    "width": 680,
    "highlights": null
}