Angular Html Editor - Missing support for <hr>

I'm using dx-html-editor (by DevExtreme) to have a WYSIWYG text editor.

I wish I had the chance to add hr tags to the content but it doesn't seem to be available in the default toolbar

Here's what I have so far:

<dx-html-editor [height]="290" [(value)]="this.item.content">
  <dxo-toolbar [multiline]="true">

    <dxi-item name="undo"></dxi-item>
    <dxi-item name="redo"></dxi-item>
    <dxi-item name="separator"></dxi-item>
    <dxi-item name="separator"></dxi-item>

    <dxi-item name="bold"></dxi-item>
    <dxi-item name="italic"></dxi-item>
    <dxi-item name="strike"></dxi-item>
    <dxi-item name="underline"></dxi-item>
    <dxi-item name="separator"></dxi-item>

    <dxi-item name="orderedList"></dxi-item>
    <dxi-item name="bulletList"></dxi-item>
    <dxi-item name="separator"></dxi-item>

    <dxi-item name="header" [acceptedValues]="[false, 1, 2, 3, 4, 5]"
      [options]="{ inputAttr: { 'aria-label': 'Header' } }">
    </dxi-item>
    <dxi-item name="separator"></dxi-item>

    <dxi-item name="color"></dxi-item>
    <dxi-item name="background"></dxi-item>
    <dxi-item name="separator"></dxi-item>

    <dxi-item name="link"></dxi-item>
    <dxi-item name="image"></dxi-item>
    <dxi-item name="separator"></dxi-item>

    <dxi-item name="insertTable"></dxi-item>
    <dxi-item name="deleteTable"></dxi-item>
    <dxi-item name="insertRowAbove"></dxi-item>
    <dxi-item name="insertRowBelow"></dxi-item>
    <dxi-item name="deleteRow"></dxi-item>
    <dxi-item name="insertColumnLeft"></dxi-item>
    <dxi-item name="insertColumnRight"></dxi-item>
    <dxi-item name="deleteColumn"></dxi-item>
  </dxo-toolbar>
  <dx-validator>
    <dxi-validation-rule type="required" i18n-message message="Content is required">
    </dxi-validation-rule>
  </dx-validator>
  <!-- Media Resizing -->
  <dxo-media-resizing [enabled]="true"></dxo-media-resizing>
  <dxo-image-upload [tabs]="['file']" fileUploadMode="base64">
  </dxo-image-upload>
</dx-html-editor>