Normally one defines all normal, bold, italic, bold italic font in alacritty. But since fira mono does not have italic font, how should the config structure look like?

"font": {
"normal": {"family": "FiraMono Nerd Font", "style": "Regular"},
"bold": {"family": "FiraMono Nerd Font", "style": "Bold"},
"size": 10
}

Should I define the fonts which are available like normal, bold and leave italic and bold italic. Or should I just define normal font?