I wouldn't want it.
If I were to write for a VN, I'd rather make the whole story while thinking that it would be made for a VN from the start.
Similarly, if I were to make a story for an RPG or whatever, I'd rather have a story made for that game, and not have my published novel adapted to the game medium.
I mean, I usually write fluffy slice of life or romance... Those tend to not fit games very well (well, they can fit VNs though), so like... I'd need to make some weird system that works for a slice of life/romance novel? Uhn... I don't think I'd like doing that.
I'd rather get a solid system first, and then make a story that can be told by using said system properly and being completemented by it. The gameplay is the priority in a game, so I don't think it makes much sense to start by the story, especially if the story doesn't fit the needs of the genre much.