カスタムHTMLに保存ができない。

カスタムHTMLとブロックにトレーディングビューのHTMLを貼りたくて何度も試したがエラー表示が出たり、保存の待機時間が永遠と続いて結局保存できません。
他のヴィジットでも良いからトレーディングビューのヴィジットを一つでも読み込んで欲しいと思っているので、一例として一つ下記に添付します。

<!-- TradingView Widget BEGIN -->
<div class="tradingview-widget-container">
  <div class="tradingview-widget-container__widget"></div>
  <div class="tradingview-widget-copyright">TradingView提供の<a href="https://jp.tradingview.com/markets/cryptocurrencies/" rel="noopener" target="_blank"><span class="blue-text">ビットコインとアルトコインの価格</span></a></div>
  <script type="text/javascript" src="https://s3.tradingview.com/external-embedding/embed-widget-market-overview.js" async>
  {
  "title": "暗号資産",
  "title_raw": "Cryptocurrencies",
  "tabs": [
    {
      "title": "概要",
      "title_raw": "Overview",
      "symbols": [
        {
          "s": "CRYPTOCAP:TOTAL"
        },
        {
          "s": "BITSTAMP:BTCUSD"
        },
        {
          "s": "BITSTAMP:ETHUSD"
        },
        {
          "s": "FTX:SOLUSD"
        },
        {
          "s": "BINANCE:AVAXUSD"
        },
        {
          "s": "COINBASE:UNIUSD"
        }
      ],
      "quick_link": {
        "title": "その他の暗号資産",
        "href": "/markets/cryptocurrencies/prices-all/"
      }
    },
    {
      "title": "ビットコイン",
      "title_raw": "Bitcoin",
      "symbols": [
        {
          "s": "BITSTAMP:BTCUSD"
        },
        {
          "s": "COINBASE:BTCEUR"
        },
        {
          "s": "COINBASE:BTCGBP"
        },
        {
          "s": "BITFLYER:BTCJPY"
        },
        {
          "s": "CEXIO:BTCRUB"
        },
        {
          "s": "CME:BTC1!"
        }
      ],
      "quick_link": {
        "title": "その他のビットコインペア",
        "href": "/symbols/BTCUSD/markets/"
      }
    },
    {
      "title": "イーサリアム",
      "title_raw": "Ethereum",
      "symbols": [
        {
          "s": "BITSTAMP:ETHUSD"
        },
        {
          "s": "KRAKEN:ETHEUR"
        },
        {
          "s": "COINBASE:ETHGBP"
        },
        {
          "s": "BITFLYER:ETHJPY"
        },
        {
          "s": "BINANCE:ETHBTC"
        },
        {
          "s": "BINANCE:ETHUSDT"
        }
      ],
      "quick_link": {
        "title": "その他のイーサリアムペア",
        "href": "/symbols/ETHUSD/markets/"
      }
    },
    {
      "title": "ソラナ",
      "title_raw": "Solana",
      "symbols": [
        {
          "s": "FTX:SOLUSD"
        },
        {
          "s": "BINANCE:SOLEUR"
        },
        {
          "s": "COINBASE:SOLGBP"
        },
        {
          "s": "BINANCE:SOLBTC"
        },
        {
          "s": "HUOBI:SOLETH"
        },
        {
          "s": "BINANCE:SOLUSDT"
        }
      ],
      "quick_link": {
        "title": "その他のソラナペア",
        "href": "/symbols/SOLUSD/markets/"
      }
    },
    {
      "title": "ユニスワップ",
      "title_raw": "Uniswap",
      "symbols": [
        {
          "s": "COINBASE:UNIUSD"
        },
        {
          "s": "KRAKEN:UNIEUR"
        },
        {
          "s": "COINBASE:UNIGBP"
        },
        {
          "s": "BINANCE:UNIBTC"
        },
        {
          "s": "KRAKEN:UNIETH"
        },
        {
          "s": "BINANCE:UNIUSDT"
        }
      ],
      "quick_link": {
        "title": "その他のユニスワップペア",
        "href": "/symbols/UNIUSD/markets/"
      }
    }
  ],
  "title_link": "/markets/cryptocurrencies/prices-all/",
  "width": 400,
  "height": 660,
  "showChart": true,
  "showFloatingTooltip": false,
  "locale": "ja",
  "plotLineColorGrowing": "#2962FF",
  "plotLineColorFalling": "#2962FF",
  "belowLineFillColorGrowing": "rgba(41, 98, 255, 0.12)",
  "belowLineFillColorFalling": "rgba(41, 98, 255, 0.12)",
  "belowLineFillColorGrowingBottom": "rgba(41, 98, 255, 0)",
  "belowLineFillColorFallingBottom": "rgba(41, 98, 255, 0)",
  "gridLineColor": "rgba(240, 243, 250, 0)",
  "scaleFontColor": "rgba(120, 123, 134, 1)",
  "showSymbolLogo": true,
  "symbolActiveColor": "rgba(41, 98, 255, 0.12)",
  "colorTheme": "light"
}
  </script>
</div>
<!-- TradingView Widget END -->

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