Question about Iron Man Noir

I've recently become very intrigued with Noir verse and now I'm thinking about offering it as one of my fandoms for the CapIM holiday exchange (and hey, it'd be awesome to offer something as an alternative to the MCU I'm always leaning on).

But I'm a little bit confused? From what I understand, there are only 4 Iron Man Noir comics out and none of them seem to have Steve in them. Just want to make sure that noir!Steve is a fanon creation, not explicitly canon? (Or am I missing some comics?)

@ishipallthings, maybe you can clear this up for me? You're the one who introduced me to all this Noir awesomeness, after all. ;))