Hi
There is probably a way to add new styles and fonts to HtmlArea
Hello @mehdi , currently you can adjust a set of tools on the editor’s toolbar and list of headings available for a formatting tool in editor, howerver styles and fonts customization is not available at least for now, but we will dicuss adding it in the next releases
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thanks for your attention
Is it clear when it will be offered?
And if possible add support for Text direction (Bidi)
thanks and grateful
Hello @mehdi
We have no plan atm to add fonts to the rich text editor.
However we launch a proof of concept to implement custom styles and we will have a look at Text direction (BiDi)
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For font adjustment you can use Fonts and FontStyle plugins described here. It won’t let you customise fonts, though.
Sorry about the confusion for fonts - there was a knowledge gap related to the fact that fonts were actually already a supported option for the htmlArea. 
. Anyway, going forward styles (when implemented) are certainly the preferred way to handle this if you are looking for a future-proof solution.