webpack5, CSS圧縮でfont-familyのダブルクォーテーション(")を消さない方法

const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const isSourceMap = MODE === "development";

const CSSLoader = {
  loader: "css-loader",
  options: {
    url: false,
    sourceMap: isSourceMap,
    importLoaders: 2,
  },
};

const PostCSSLoader = {
  loader: "postcss-loader",
  options: {
    sourceMap: isSourceMap,
    postcssOptions: {
      plugins: [
        require("cssnano")({
          preset: ['default', {minifyFontValues: {removeQuotes: false}}]
        }),
        require("autoprefixer")({
          grid: true,
        }),
      ],
    },
  },
};

const SassLoader = {
  loader: "sass-loader",
  options: {
    sourceMap: isSourceMap,
  },
};

module.exports = {
  // module->rules以外は省略

  module: {
    rules: [
      /*
       * sass, non-autoprefixer, minify, export -> .css
       */
      {
        test: /amp-[a-z]*\.scss$|amp\.scss$/,
        use: [
          MiniCssExtractPlugin.loader,
          CSSLoader,
          PostCSSLoader,
          SassLoader,
        ],
      }, 
    ],
  },
};