It seems like you already understand what dual intent means- it's both a temporary working visa and a path to a Green Card. Yes, the government issues I-140s to H1-Bs, which are another step on the path to a GC. The government has an entire series of steps laid out for H1-B visa holders to follow to get a Green Card. I think just Googling 'H1-B dual intent' is going to give you more info than I could realistically fit in a comment here