Doctor Who The Official Annual 2024 (in-universe)

The Fourteenth Doctor once wrote a letter to the readers of an annual, after the span of a year since his previous letter, adding that that was "the whole idea" of an annual. (PROSE: )

Behind the scenes
The annual was only referred to as "an annual" in A Letter from the Doctor but it was clearly intended to be an in-universe counterpart of Doctor Who The Official Annual 2024.