H1 is rendered with the same font size as regular text in rich text field

[MrBzik]

Hi, I am stuck with rendering headings using rich text field.

It is displayed as a Normal text.
I tried different approaches, like so to no success:
<RichText data={data.description} />
Also like this:
const html = convertLexicalToHTML({ data: data.description })

<div dangerouslySetInnerHTML={{__html: html}} />

Actually I came to a haste conclusion, based on h1 rendering with the same font size as a regular text. And I would expect it to be bigger. I wonder why it behaves like this