BorderSide

{
  "description": "Top border override for this cell.",
  "type": "object",
  "properties": {
    "color": {
      "description": "Border color for this side.",
      "type": "string"
    },
    "width": {
      "description": "Border width in pixels for this side.",
      "type": "number"
    },
    "style": {
      "description": "Border style for this side.",
      "type": "string",
      "enum": [
        "solid",
        "dashed",
        "dotted",
        "none"
      ]
    }
  }
}