Allow Legal to be "movable" in user account settings.

I am using vertical tabs to separate different kind of widgets on user account edit form. Besides setting widgets introduced by the Drupal core I have created several custom fields to enable users to configure some behavior of the site. Using vertical tabs make these settings clear and transparent.

Terms and conditions of the Legal module are being displayed in the account edit at the very bottom of the form. However I am not able to move them into some of tabs. In settings (admin/config/people/accounts/fields) the legal module does not present any movable widget or object.
How could this be achieved please?