We have a <View> and <Image> that works on iOS and Android. We also had web implementations working as a proof of concept but I'm curious if the community would be more interested in helping us implement/maintain the web implementations since we want to focus more on the integrations with each native platform for now.

You're probably aware, but it's always good to keep in mind that we don't have a goal to allow people to "write your app once, run anywhere". You should be able to share as much code as you want to share, but the truth is that great mobile experiences design not only for the platform, but even for the device. We should build apps that take advantage of the extra screen real estate on an iPhone6+, for example. So even within a single platform, you'll want to design specific experiences, and the same goes for implementations across different platforms.