flutter_svg/example/assets/simple/use_circles.svg

<svg viewBox="0 0 30 10"
    xmlns="http://www.w3.org/2000/svg">
    <circle id="myCircle" cx="5" cy="5" r="4"/>
    <use href="#myCircle" x="10" fill="blue"/>
    <use href="#myCircle" x="20" fill="white" stroke="blue"/>
</svg>