Allow subscript and superscript functions

[virgile-dev]

Is your feature request related to a problem? Please describe.
In order to type x₃ x³
I have to copy paste it form another website.

Describe the solution you'd like
I'd like to be able to simply be able to write x^3 and x_3

Describe alternatives you've considered
Have a LaTeX inline block.

Additional context
Add any other context or screenshots about the feature request here.

Bonus
[x] I'm a sponsor and would appreciate if you could look into this sooner than later 💖

[woutervroege]

linking product goal: TypeCellOS/Product#42

[StephanMeijer]

In addition to supporting math, I would very much appreciate supporting superscript and subscript seperately, similar to Tiptap supporting subscript, superscript and math seperately from eachother.

[gsingh-ds]

Not Sure when blocknote will support it natively, in the meantime: https://github.com/defensestation/blocknote-subscript-superscript and https://github.com/defensestation/blocknote-math

[joh-klein]

Adding a use case to this: we are moving an existing rich-text editor's stored HTML to BlockNote. That content is technical documentation, where <sub> and <sup> mostly carry units and formulas (m², H₂O, 10⁻³).

• Import: BlockNote's HTML import drops both tags silently. The text survives but its meaning changes: m² becomes m2.
• Inline math doesn't replace it. The stored content is plain HTML, and authors treat sub/superscript as text formatting, not as an equation.

For now we use two small custom styles: createStyleSpec with propSchema: "boolean", rendering and parsing <sub> and <sup>. That covers import and rendering. A toolbar button and the exporters are still missing.

Is native support still planned? If so, would you accept a PR that adds subscript and superscript to the default styles, with formatting-toolbar buttons and the exporter mappings (docx, PDF, ODT, email)? Or would you rather keep them as custom styles? We'd be happy to do the work.