To add web fonts to CKEditor 5, you need to include the font files (e.g., from Google Fonts) on your website and then configure CKEditor 5 to recognize and use them. This involves adding the font files to your project, typically in a fonts directory, and then updating your CKEditor 5 configuration to include the font names in the fontFamily dropdown and potentially adjusting styles.
For detailed guidance, refer to the editor and content styles and font family, size, and color documentation.