Make it clearer that the JSON editor exists

### What feature do you want to see added?

Make it clearer that the JSON editor exists and is available for use. Consider highlighting good scenarios to use it.

### Why do you want this feature? Does it solve a problem?

Feedback indicates that it's not obvious to users that an alternative editor exists, and consequently they make edits using the prompting editor that might be better suited to the JSON editor.

### How should the feature be implemented?

Perhaps a small sentence/footnote indicating what the current editor is good for, and what they should switch to the JSON editor for?

### Additional context (if applicable)

_No response_

Locate the interface for the prompting editor and the existing JSON editor, then review how the two editing options are presented to users. Add concise guidance explaining when the current editor is useful and when users should switch to the JSON editor, and verify that the guidance is visible and understandable in the relevant interface.

Written by the indexing model from the issue text.