The short answer is you can’t.
But you can do something really useful: create a QuickAction in Automator that opens selected images in Adobe Photoshop Elements (or any app you want), make it appear in the main right-click menu and event set a shortcut.
See the image for the QuickAction settings
View attachment 2627019
To make it appear in the main right-click menu, after saving the QuickAction in Automator, run in Terminal:
Code:
/usr/libexec/PlistBuddy -c "Delete :NSServices:0:NSIconName key" ~/Library/Services/OpenInPhotoshop.workflow/Contents/Info.plist; killall Finder
To set a shortcut, System Settings - Keyboard - Keyboard Shortcuts - Services – Pictures - OpenInPhotoshop