I would love to be able to save Field Calculation Arcade/SQL Expressions as shareable items.
Use case: I have some non-technical, non-GIS, non-AGOL trained staff who will need to be able to view a polygon layer table, select a column, and calculate all the records for a given column to a single value. Instead of having them do that in any of the myriad of manual ways, it would be great to be able to create an Arcade or SQL expression, save that as a shareable item, and then even associate that expression with say an Experience Builder button. The result would be an easy UX that allows these users to fire up a web experience, click the appropriate buttons, and have the record attributes in the polygon layer update accordingly.