Arcade expressions currently are not supported for Heat Maps.
To use Arcade expression with the Heat Map symbology style on ArcGIS Online.
So, I do not need to add a permanent field within the dataset.
Heatmap is using feature density with kernel proximity method which does not leverage a field.
https://developers.arcgis.com/javascript/latest/api-reference/esri-renderers-HeatmapRenderer.html
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