I was looking to use a URL in the popup of our plantation layer to launch Survey123 and pass the geometry across, but what I REALLY wanted was to use Arcade to not only pass the geometry of the selected polygon, but to also select all polygons with common attributes, dissolve those and pass across a multipart polygon. Doesn't seem I could make this happen.
IDEA: Add a Dissolve function for aggregating data. I can see other uses for this type of function as well (i.e. reporting/summarising in popups but understand this can be achieved in other ways as well).