I am trying to show labels for overlapping features in a single feature class in ArcGIS Online and am not having any luck.

[PersefoniKapotas]

  I have a point layer, in which sometimes there are multiple points in one location (they are stacked one on top of the other).  I have labels set up for the 'project number' field.  In ArcGIS Pro, the labels for each point show up surrounding the point(s), but when I share to AGOL only one of the labels show.  Ideally, I would like for all labels to appear.  How can I do this?  Any ideas?

[SimonSchütte_ct]

Maybe using Arcade Expressions to build labels from overlapping features could be a solution.
How To: Create Multiline Labels in ArcGIS Online Map Viewer
It may be necessary to generate a Key Value field, so we know features belong to each other.
or using geometry functions like described here:
Use Arcade geometry functions with FeatureSets to provide spatial context