It would be nice to be able to add symbols (ex. %, $, °, €, etc.) and suffixes (ex. ft, ft², m, km, etc.) to data in pop-ups without having to use Arcade expressions. If you have a large amount data and you want to display it in pop-ups it is very time consuming having to write an arcade expression for each and every one. Maybe have a dropdown next to Field Alias in Configure Attributes when you are configuring pop-ups. I know you can add suffixes if you go into Fields View and Number Format in Pro so that same ability to carryover into AGOL would be nice.
