Does anyone know how I can add a new link button to perform custom actions for the fields Image, General Link and Rich text editor on the content editor?
What I'm looking for in this case is to add a new link besides the "Edit HTML" link to perform custom actions. The same would go for the fields General Link and Image.
UPDATE: Although Dylan's response does cover part of the question I'm expanding the question to be more specific. It's not just creating the menu items on core but the implementation of it. So here are two points:
a) ideally not use a new custom field but instead add a new menu item to existing field types
b) how should be the declaration of the menu items in terms of specifying what are the commands that it trigger and how should those be implemented? For example in Experience Editor one might declare a command on a config patch file setting the type and using it to trigger the command. How would that go for the content editor?