Ask HN: Options to set up in motion an allegedly killer idea while employed?

I'm employed in a new job that will let me little time to focus on it. I will develop a document about the idea that wholly describes it and the big problem it solves and the improvements to current solutions. It's easily monetizable and it really innovates it's field, which is something humans always have done and always will do. Future proof and it will open a new market and type of job too that will grow in the future. I don't see myself doing it with my own money as I think this is the type of idea that will work much better with external funding and some dedicated team for it. I'm yet another idea guy, yeah I know. But I would like to know if there is any type of agreement I can reach with some VC about it or if I can set it up in motion another way without needing to involve VCs at the beginning.