Maybe write it like a Q&A but you’re doing both parts.
Imagine the writing is already done. You’re asked to do a FAQ about the writing, its characters, and because they invited questions by true fans of the piece, you include some detail points that only a fandom would pay attention do.
“So what did you mean when you had [x] do [y] at the [z] when [a] was [b] the [c] with the [m] and their [n]?
and simpler things like:
“What was your inspiration?”
and
“Where are you taking it after this?”
etc.