Using Javascript in map tips on iPhone

[cxcandid]

I have a map tip configured in QGIS 3.34 (Windows) that shows elevation data using Javascript. My point layer has fields x and y in EPSG:31255 and retrieves ground elevation using the Austrian Voibos service: https://voibos.rechenraum.com/voibos/voibos?name=hoehenservice&Koordinate=56920,318950&CRS=31255

<table>
<tr><td>Elevation:</td><td id="elev"></td></tr>
</table>
<script>
function roundToTwo(num) {
    return +(Math.round(num + "e+2")  + "e-2");
}
var getJSON = function(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.open('GET', url, true);
    xhr.responseType = 'json';
    xhr.onload = function() {
      var status = xhr.status;
      if (status === 200) {
        callback(null, xhr.response);
      } else {
        callback(status, xhr.response);
      }
    };
    xhr.send();
};
getJSON('https://voibos.rechenraum.com/voibos/voibos?name=hoehenservice&Koordinate=[% x %],[% y %]&CRS=31255',
function(err, data) {
  if (err == null) {
	document.getElementById("elev").innerHTML = data.hoeheDTM.toFixed(2).concat('m');
  }
});
</script>

Is there any chance to get this running in Mergin Maps on iPhone, or can I use a custom Python expression function to solve my issue?