By what means can I force Upper Case when entering attribute values?

Question

I have editors creating new features and then providing attribute values.  I need those attribute values to be entered using UPPER CASE Only.   By what mans can I get that accomplished?  
Is that a DOMAIN thing?

Using ArcGIS Portal 10.7.1
The app is a Portal App populating a SQL Server (SDE) feature class.
Users are creating these features using the Smart Editor in a Portal APP.

Anonymous User · Answer

Hi Alex,

If there are a limited number of values that the editors are providing, then you could look into configuring domains on the feature service: https://pro.arcgis.com/en/pro-app/help/data/geodatabases/overview/an-overview-of-attribute-domains.htm

Other than that, it may be possible to use attribute rules, but I personally haven't seen this done before. Maybe try posting over on that product page as well: https://community.esri.com/t5/attribute-rules/ct-p/attribute-rules

-Calvin