convert-svg-path-to-css-clip-path.js

const svgPolygon = '12.034 19.674 10.634 18.28 14.309 14.61 2.125 14.61 2.125 12.572 14.309 12.572 10.634 8.897 12.034 7.508 18.117 13.591';
const viewBoxWidth = 25;
const viewBoxHeight = 25;
const array = [...svgPolygon.matchAll(/[\d.]+/g)];
let output = '';
array.forEach((item, key) => {
  if (key % 2 === 0) {
    output += `${(Math.round(((item / viewBoxWidth) * 100) * 1000)) / 1000}% `;
  } else {
    output += `${(Math.round(((item / viewBoxHeight) * 100) * 1000)) / 1000}%`;
    if (key !== array.length - 1) {
      output += ', ';
    }
  }
});
console.log(output);