Customizable access message for password-protected pages

When a page is password-protected, it would be helpful to display a customizable message explaining how users can gain access.

Currently, users only see the password prompt, which can be confusing if access depends on external conditions (e.g. being logged into another system or using “Passing the password via URL”).

Suggested solution:

Add a configurable, multi-line text field that allows defining a custom message displayed alongside the password prompt.

The field should support basic formatting (e.g. bold, italic, line breaks) to clearly guide users.

Use case:

We use “Passing the password via URL”, where users must be logged into our shop to gain access automatically. A custom message would allow us to explain this directly on the protected page.