Elevation has been requested and declined previously. You can see related discussion and workarounds in these topics (and others):
https://forum.inaturalist.org/t/altitude-on-observations/1476
https://forum.inaturalist.org/t/filter-by-elevation/5606
https://forum.inaturalist.org/t/add-a-link-to-google-earth-for-altitude-information/37680
https://forum.inaturalist.org/t/an-optimized-workflow-to-determine-the-altitude-of-an-observation/17465
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