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input.scss

@mixin font-face($name, $path, $weight: null, $style: null, $exts: woff2 woff) {
	$src: null;

	@each $ext in $exts {
		$src: append($src, url(quote($path + "." + $ext)) format(quote($ext)), comma);
	}

	@font-face {
		font-family: quote($name);
		font-style: $style;
		font-weight: $weight;
		font-display: swap;
		src: $src;
	}
}

@include font-face(One, fonts/one);

@font-face {
    font-family:'Roboto';
    font-style: normal;
    font-weight: 400;
    src: 
      local('Roboto'),          // Erst nachsehen, ob die Schrift 
      local('Roboto-Regular'),  // beim Besucher schon installiert ist
      url(fonts/roboto-v18-latin-regular.woff2) format('woff2'), // Wenn nicht, wird die Schrift vom Webserver geladen
      url(fonts/roboto-v18-latin-regular.woff) format('woff');   // Am Ende das Schlusslicht für IE11
}

output.css

@font-face {
  font-family: "One";
  font-display: swap;
  src: url("fonts/one.woff2") format("woff2"), url("fonts/one.woff") format("woff");
}
@font-face {
  font-family: "Roboto";
  font-style: normal;
  font-weight: 400;
  src: local("Roboto"), local("Roboto-Regular"), url(fonts/roboto-v18-latin-regular.woff2) format("woff2"), url(fonts/roboto-v18-latin-regular.woff) format("woff");
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.32.12",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}