It would be great if we could customize font by importing a JSON file in addition to being able to customize color.
The problem is that we can customize the font basicaly in the json theme file. But https://learn.microsoft.com/en-us/power-bi/fundamentals/power-bi-browsers states clearly that if the font is not installed on the user machine it will not work. in some documents the fonts are embedded, like a pdf document. but the power bi service is not a document its more of a website. maybe the solution would be using webfonts like in CSS https://www.w3schools.com/css/css3_fonts.asp but that is not implemented in the power bi service as of now.
