With macOS 10.13.6, I'm trying to change the menu item pointed out by the red arrow.

In TextEdit:

in Chrome

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?

If typical preference setting cannot do that, is it possible to do that by modifying system plist or by programming for it?