I'm trying to change the menu item pointed out by the red arrow.

In TextEdit:

in Chrome

clicking that item gets

Look Up now shows personalized suggestions from the web, iTunes, the App Store, movie showtimes, locations nearby, and more. To make suggestions more relevant to you, Look Up includes your approximate location with search requests to Apple.

You can adjust this in System Preferences.

I tried the steps on a post, which is based on the existing services in Shortcuts, while my goal is to customize that item to "look up that selected words on the Cambridge Dictionary". Can someone help me on this?