Hi!
I tried to use custom config for adding format styles with submenus.
This is example of my config:

<?xml version="1.0" encoding="utf-8"?>
<DataType Key="47ab957d-f317-474a-bb22-334067cbcc27" Alias="NewRichTextEditor" Level="2">
  <Info>
    <Name>NewRichTextEditor</Name>
    <EditorAlias>Umbraco.TinyMCE</EditorAlias>
    <DatabaseType>Ntext</DatabaseType>
    <Folder>RTE</Folder>
  </Info>
  <Config><![CDATA[{
  "Editor": {
    "toolbar": [
      "ace",
      "removeformat",
      "styleselect",
      "bold",
      "italic",
      "underline",
      "strikethrough",
      "bullist",
      "numlist",
      "link",
      "unlink"
    ],
    "maxImageSize": 500,
    "mode": "classic"
  },
  "OverlaySize": null,
  "HideLabel": false,
  "IgnoreUserStartNodes": false,
  "MediaParentId": null
}]]></Config>
    <customConfig>
        <config key="style_formats">
            [{"title":"Headers","items":[{"title":"Header 1 (H1)","block":"h1"},{"title":"H1 Lookalike","selector":"p,span","classes":"h1"},{"title":"Header 2 (H2)","block":"h2"},{"title":"H2 Lookalike","selector":"p,span","classes":"h2"},{"title":"Header 3 (H3)","block":"h3"},{"title":"H3 Lookalike","selector":"p,span","classes":"h3"}]},{"title":"Quotes","items":[{"title":"Style A","block":"blockquote","classes":"quote-a"},{"title":"Style B","block":"blockquote","classes":"quote-b"}]},{"title":"Links","items":[{"title":"CTA Loud","selector":"a","classes":"cta cta-loud"},{"title":"CTA Subtle","selector":"a","classes":"cta cta-subtle"},{"title":"Button look-a-like","selector":"a","classes":"btn btn-mimic"}]},{"title":"Inline colours","items":[{"title":"Orange","inline":"span","classes":"orange"},{"title":"Red","inline":"span","classes":"red"},{"title":"Blue","inline":"span","classes":"blue"}]}]
        </config>
    </customConfig>
</DataType>

But there is no my config.
This formats looks like default.

What I did wrong? How I can set my format styles with sub-menus?