svglib svglib ignores <switch> nodes

Is it possible to add support for at least default cases (without requiredFeatures)?

My case: I use rst2pdf to compile document containing svg images. Those svg images are exported from draw.io. draw.io uses <switch> when exporting to svg for all text blocks.

Example:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="121" height="61" viewBox="-0.5 -0.5 121 61">
  <rect width="120" height="60" rx="9" ry="9" fill="#FFF" stroke="#000" pointer-events="all"/>
  <switch transform="translate(-.5 -.5)">
    <foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow:visible;text-align:left">
      <div xmlns="http://www.w3.org/1999/xhtml" style="display:flex;align-items:unsafe center;justify-content:unsafe center;width:118px;height:1px;padding-top:30px;margin-left:1px">
        <div data-drawio-colors="color: rgb(0, 0, 0);" style="box-sizing:border-box;font-size:0;text-align:center">
          <div style="display:inline-block;font-size:12px;font-family:Helvetica;color:#000;line-height:1.2;pointer-events:all;white-space:normal;overflow-wrap:normal">
            some text
          </div>
        </div>
      </div>
    </foreignObject>
    <text x="60" y="34" font-family="Helvetica" font-size="12" text-anchor="middle">some text</text>
  </switch>
</svg>

As a result, all text in the images is lost after assembly.