It seems the editor just relies on a Text block at the moment, Unfortunately, this force to write those elements in the HTML view, or create a custom block for each.
We noticed this Bootstrap Blocks set https://github.com/kaoz70/grapesjs-blocks-bootstrap4 uses a parametric Heading Block and a Paragraph Block.
It would be a great addition to this super plugin for OctoberCMS. Alternatively, it would be great to know how to extend Grapesjs within the plugin. Another case is the ECharts Block set here ) https://github.com/jvas28/grapesjs-echarts