Hi Kaio, there is currently no such annotations shape in in the visual overview framework.
However, there are a few alternatives you can try:

• A setvar shape, setting a session variable that is not used for anything else. If you want to keep it specific to a single card or page, you can use the cardvar or pagevar scopes. This is the simplest solution, but will show only one line and has no formatting support.
• A link shape using # before the hyperlink to show the page inline, referring to an online notetaking service. Doing a quick online search I found that rapidtables notepad does not require any login, so it may be the easiest to implement (there may be others that do not require login too). Other well-know alternatives are Microsoft OneNote online, Evernote, Google Keep, ... but these do require a login.