Documentation says that it is possible to create custom Attributes
https://github.com/singerdmx/flutter-quill/blob/master/doc/attribute_introduction.md :

import 'package:flutter_quill/flutter_quill.dart';

const String highlightKey = 'highlight';
const AttributeScope highlightScope = AttributeScope.inline;

class HighlightAttr extends Attribute<bool?> {
  HighlightAttr(bool? value) : super(highlightKey, highlightScope, value);
}

But is it possible to use them in the same way you would use any other attribute in the QuillToolbarToogleStyleButton? Using a custom attribute in it will obviously result in an error due to the fact the it has no default tooltip and icon.

Therefore, I've tried creating my own custom toggle button based on the toogle style button (exact 1:1 copy, except for the fact that the default tooltip and icon are provided). The issue I'm running into is that the button automatically toggles off after typing the first character. Using one of the built in the package attributes (BoldAttribute etc.) in my custom toggle button works as expected and this bug doesn't persist.

I'm attaching a video of the issue to make it more clear.

Any suggestion on how i can approach this issue?
Thanks in advance