Font Settings for the default editor content

I am making a font menu. At present, I want to select a font as the default font when I start typing, but I have a problem here. I don’t know how to set it! My version is vue nested, if you want any advice, it is necessary for me

font is not a node, but an attribute on paragraph, heading etc. Add that attribute then set the font-family from CSS

Yes, I added it using css properties, and I wanted to open the editor by default and enter the text with a certain font property, so he would enter it with a certain font by default, image

This looks like a CSS problem, why don’t you just set font-family, what’s your issue?