How to add a new page to the theme

How do I add new pages in the user’s administrative panel?
Inside the mytheme / account / template.ftl file has the menu mapping, but I would like to add an xyz.ftl page and add it to the menu. Thank you.

exemple: http://localhost:8080/auth/realms/test/account/xyz

My menu: Captura de tela de 2020-06-17 15-17-23

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