Is it possible to put multiple Representations into a single AdaptationSet?

[deppischCode]

Hello community,

thank you very much for reading my question, and if you're a contributor to this project thank you for your awesome work.
I have the following client-php for generating a dash compatible .mpd file as well as .m4s files:

use Streaming\FFMpeg;
use Streaming\Format\X264;
use Streaming\Representation;

$rep = new Representation();

$ffmpeg = FFMpeg::create();
$video = $ffmpeg->open('path/to/input.mp4');

$format = new X264();

$r_360p = (new Representation())->setKiloBitrate(800)->setAudioKiloBitrate(128)->setResize(640, 360);
$r_1080p = (new Representation())->setKiloBitrate(2500)->setAudioKiloBitrate(192)->setResize(1920, 1080);

$video->dash()
->setFormat($format)
->addRepresentations([$r_360p, $r_1080p])
->save('path/to/output.mpd');

// Alternatively, I tried this version,
// but the output was similar to the method-chain-call from above:

$video->dash()
->setFormat($format)
->addRepresentation($r_360p)
->addRepresentation($r_1080p)
->save('path/to/output.mpd');

This produces an .mpd file, which wraps each Representation into a single AdaptationSet, like this:

<AdaptationSet id="0" contentType="video" startWithSAP="1" segmentAlignment="true" bitstreamSwitching="true" frameRate="25/1" maxWidth="1920" maxHeight="1080" par="16:9" lang="und">
  <Representation id="0" mimeType="video/mp4" codecs="avc1.640028" bandwidth="2500000" width="1920" height="1080" sar="1:1">
    <SegmentTemplate timescale="12800" initialization="output_init_$RepresentationID$.m4s" media="output_chunk_$RepresentationID$_$Number%05d$.m4s" startNumber="1">
      <SegmentTimeline>
        <S t="0" d="128000" r="1" />
        <S d="124416" />
      </SegmentTimeline>
    </SegmentTemplate>
  </Representation>
</AdaptationSet>
<AdaptationSet>
  <!-- ... -->
</AdaptationSet>
<!-- etc. -->

So with PHP-FFmpeg-video-streaming, is it possible to wrap more than one Representation into a single AdaptationSet? Like:

<AdaptationSet id="0" contentType="video" startWithSAP="1" segmentAlignment="true" bitstreamSwitching="true" frameRate="25/1" maxWidth="1920" maxHeight="1080" par="16:9" lang="und">
  <Representation id="0" mimeType="video/mp4" codecs="avc1.640028" bandwidth="2500000" width="1920" height="1080" sar="1:1">
    <SegmentTemplate timescale="12800" initialization="output_init_$RepresentationID$.m4s" media="output_chunk_$RepresentationID$_$Number%05d$.m4s" startNumber="1">
      <SegmentTimeline>
        <S t="0" d="128000" r="1" />
        <S d="124416" />
      </SegmentTimeline>
    </SegmentTemplate>
  </Representation>
  <Representation id="2" mimeType="video/mp4" codecs="avc1.64001e" bandwidth="800000" width="640" height="360" sar="1:1">
    <SegmentTemplate timescale="12800" initialization="de_03_giant-steps_head-two-part_init_$RepresentationID$.m4s" media="de_03_giant-steps_head-two-part_chunk_$RepresentationID$_$Number%05d$.m4s" startNumber="1">
      <SegmentTimeline>
        <S t="0" d="128000" r="1" />
        <S d="124416" />
      </SegmentTimeline>
    </SegmentTemplate>
  </Representation>
</AdaptationSet>

I am very much looking forward to receiving a reply. Thank you very much in advance!
Nico