Global convert to uppercase and lowercase in macOS? In Mail.app and Text.app there's Edit > Transformations:


Make Upper Case
Make Lower Case
Capitalize


...but I see no keyboard shortcut options in:
System Preferences > Keyboard > Shortcuts:: Services.

Is there a way to get this functionality available globally for all text entry? For example, web based forums like Stack Exchange.

Of note, the options are available in Safari.app's Edit > Transformations menu:



...but not in Chrome.app:



I could change my browser habits, but it would be nice to know if there is a way to add this functionality to all "Edit" menus.
You can do it in Safari, but Chrome ignores the standard Mac Toolbox, unfortunately.  

System Prefs > Keyboard > Shortcuts > App Shortcuts

You can set key commands for All Applications, which will then work for all that have the requisite menu option.

This is my own setup, which shows keys already set for Capitalise &amp; Lower Case
I use it a lot for such as Stack Exchange.