{
  "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
  "elmType": "div",
  "style": {
    "display": "flex",
    "flex-direction": "column",
    "width": "288px",
    "height": "70px",
    "margin": "5px",
    "fill": "currentColor"
  },
  "children": [
    {
      "elmType": "div",
      "style": {
        "display": "flex",
        "justify-content": "space-between",
        "width": "105%",
        "padding-bottom": "5px"
      },
      "attributes": {
        "class": "ms-fontColor-themePrimary ms-fontWeight-bold"
      },
      "children": [
        {
          "elmType": "span",
          "txtContent": "00"
        },
        {
          "elmType": "span",
          "txtContent": "03"
        },
        {
          "elmType": "span",
          "txtContent": "06"
        },
        {
          "elmType": "span",
          "txtContent": "09"
        },
        {
          "elmType": "span",
          "txtContent": "12"
        },
        {
          "elmType": "span",
          "txtContent": "15"
        },
        {
          "elmType": "span",
          "txtContent": "18"
        },
        {
          "elmType": "span",
          "txtContent": "21"
        },
        {
          "elmType": "span",
          "txtContent": "24"
        }
      ]
    },
    {
      "elmType": "div",
      "style": {
        "width": "100%",
        "border": "2px solid",
        "height": "40px"
      },
      "attributes": {
        "class": "ms-fontColor-themePrimary"
      },
      "children": [
        {
          "elmType": "svg",
          "style": {
            "width": "100%",
            "height": "100%"
          },
          "children": [
            {
              "elmType": "path",
              "attributes": {
                "d": "= 'M ' + (Number(substring([$Start],0,2)) * 60 + Number(substring([$Start],3,5))) * 0.2 + ',0  ' + (Number(substring([$End],0,2)) * 60 + Number(substring([$End],3,5))) * 0.2 + ',0 ' + (Number(substring([$End],0,2)) * 60 + Number(substring([$End],3,5))) * 0.2 + ',40 ' + (Number(substring([$Start],0,2)) * 60 + Number(substring([$Start],3,5))) * 0.2 + ', 40 Z'"
              }
            }
          ]
        }
      ]
    }
  ]
}