Default Quill formats lost when implementing the customTagAttributes and other custom handlers

[Azuf]

When implementing any of the custom functions in the config, such as the customTagAttributes and returning classes as below, it replaces the default classes added by quill. How can I change this so it appends the custom class to the Quill classes instead?

let converter = new QuillDeltaToHtmlConverter(data, {
      customTagAttributes: (op) => {
            if (op.attributes.customAttribute) {
                  return {
                        class: "customClassForTheCustomAttribute`,
                  };
            }
      },
});

[volser]

can you provide an exmaple, please?

[SikoSoft]

Did you ever get this working? I became curious about this wanting to implement my own srcset attribute for images but don't see this callback actually running at any point.