Is there a way in the Arcade Labeling profile to access the objects related to a feature?
I came here to ask this exact question. Let me know if you figure anything out. I want to label or symbolize based on the number of related features. I found you can access related feature information in the pop-up configuration (ArcGIS Online), but not the labeling expression (or at least what I could figure out.)
Can you share how you were able to access related feature information in the pop-up configuration in ArcGIS Online? I don't see how to do that. Thanks.
This might not be what you are looking for but it worked somewhat for me since I only want the count of related features.
Go into the Configure pop-up menu. There you will have the option all the way at the bottom to "Show related data" which will put a hyperlink in the popup that will open the attribute table of the related features. But also you can click the "Configure Attributes" link.
Then you should see the related table attributes but it only appears to allow you to display a count (which again is what I needed).
And also I forgot to mention that I also see related layer/table info available in the Chart configuration at the bottom of that first screenshot.
Retrieving data ...