if you open up the CHS window, then click the "Modify Format/Case" button at top of the clip panel, that will bring you to the formatting dialog. Then choose the UPPERCASE text formatting and nothing else, then save the preset with a useful name (From preset menu). After that the new preset formatting operation will appear on your quick pop up menu under "Formatting Presets".
Adding ALL CAPS to quick modification menuThere is currently no way to assign this to a hotkey, but that is coming when i do some more CHS updates.