Support for h4 and h5 buttons in Filament v4 RichEditor toolbar

[mebron]

Describe the problem

I'm using Filament v4 and trying to extend the RichEditor to include additional heading levels (h4 and h5).
Currently, when I try to add these to the toolbar like this:

RichEditor::make('content')
    ->toolbarButtons([
        'bold',
        'italic',
        'h1',
        'h2',
        'h3',
        'h4', // ❌ Error here
        'h5', // ❌ Error here
    ]);

I get the following error:

Toolbar button [h4] cannot be found.

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What I’ve tried

• Checked the official Filament documentation — only h1, h2, and h3 are supported out of the box.
• Tried adding an extra extension or plugin to support h4 and h5, but couldn’t find a clean solution.
• Created a custom plugin to toggle TipTap heading levels 4 and 5, but it feels more like a workaround than an intended solution.

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My goal

I want to allow content editors to insert H4 and H5 headings directly from the RichEditor toolbar — just like H1, H2, and H3.

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Questions

1. Is there a built-in way to extend the heading levels in Filament v4's RichEditor?
2. If not, could support for h4 and h5 be added to the core so they can be used without custom plugins?

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Environment

• Filament: v4.x
• Laravel: v12.x
• PHP: v8.4
• Browser: Tested on latest Chrome and Firefox

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Example Use Case

Content-heavy applications like blogs, documentation systems, or marketing websites often require deeper heading structures for SEO and accessibility.
Having h4 and h5 available out of the box would make the RichEditor much more flexible.

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Additional Context

Since TipTap already supports headings up to level 6, it seems like this would just need to be exposed in Filament's RichEditor toolbar configuration.

Thanks for your amazing work on Filament! 🙌