flutter_svg/example/assets/text_transform.svg

<svg xmlns="http://www.w3.org/2000/svg" width="69" height="69" viewBox="0 0 69 69">
  <g transform="translate(-56 -50)">
    <circle cx="34.5" cy="34.5" r="34.5" transform="translate(56 50)" fill="#00b443"/>
    <text transform="translate(75 99)" fill="#fff" font-size="40" font-family="Montserrat-Bold, Montserrat" font-weight="700">
      <tspan x="0" y="0">A</tspan>
    </text>
  </g>
</svg>