Has anyone had any luck getting CustomConfig to work with TinyMCE 6/Umbraco 11?

I'm trying to add some custom style menus using "style_formats" but they just don't work.

   "CMS": {
      "Content": {
        "MacroErrors": "Throw",
        "Error404Collection": [
          {
            "Culture": "default",
            "ContentKey": "f7d4c0c8-7b6a-4d30-b7aa-e0fac492bdb9"
          }
        ]
      },
      "Hosting": {
        "Debug": true
      },
      "Runtime": {
        "Mode": "BackofficeDevelopment",
        "MaxQueryStringLength": 900,
        "MaxRequestLength": 2000000
      },
      "ModelsBuilder": {
        "ModelsMode": "SourceCodeManual",
        "ModelsNamespace": "Lcp.Core.Features.Shared.ModelsBuilder",
        "FlagOutOfDateModels": true,
        "ModelsDirectory": "~/../Lcp.Core/Features/Shared/ModelsBuilder",
        "AcceptUnsafeModelsDirectory": true
      },
      "RuntimeMinification": {
        "UseInMemoryCache": true,
        "CacheBuster": "Timestamp"
      },
      "RichTextEditor": {
        "InvalidElements": "font, span, div, br",
        "CustomConfig": {
          "entity_encoding": "raw",
          "paste_remove_styles_if_webkit": "true",
          "paste_as_text": "true",
          "style_formats": "{\"title\":\"Table\",\"items\":[{\"title\":\"Data table\",\"selector\": \"table\",\"classes\": \"table-scroller\"}]},{\"title\": \"Image\",\"items\":[{\"title\":\"Zoom Magnifier\",\"selector\":\"img\",\"classes\":\"zoom\"}]},{\"title\":\"Paragraph\",\"items\":[{\"title\":\"Emphasis\",\"selector\":\"p\",\"classes\":\"medium\"},{\"title\":\"Introduction\",\"selector\":\"p\",\"classes\":\"large\"}]}"
        }
      }