How should I build GPX contains cycle power data

[8beeeaaat]

I want add <power>number</power> extensions per trkpt like this sample.

  <trkpt lat="35.7309780" lon="139.4890750">
    <ele>42.6</ele>
    <time>2019-06-25T10:15:09Z</time>
    <extensions>
     <power>0</power>
     <gpxtpx:TrackPointExtension>
      <gpxtpx:atemp>21</gpxtpx:atemp>
      <gpxtpx:hr>80</gpxtpx:hr>
      <gpxtpx:cad>0</gpxtpx:cad>
     </gpxtpx:TrackPointExtension>
    </extensions>
   </trkpt>

[fabulator]

You can just put whatever you want into extensions. I updated the creation of point in readme example.

new Point(51.02832496166229, 15.515156626701355, {
        ele: 314.715,
        time: new Date('2018-06-10T17:29:35Z'),
        hr: 120,
        extensions: {
            power: 5,
        },
    })

[8beeeaaat]

@fabulator Thank you so much!! 🙏