Welcome to the forums!
Web Export is a plugin that uses the built in XD API to do it’s thing. It was only recently that XD added the Auto-Animate API.
So animation support is coming and some support is starting to appear but it’s not all there yet. Features like fade in and fade out, and slides are mostly working (in dev builds).
If you’d like to post your XD project here or in a direct message I can get that to the developers to work on. And they can work on anything that’s not supported yet. Our developers love examples.
We don’t have any existing examples like that yet. But that’s the right workflow. You create the design in XD and then hand it off to the developer (the same XD project) and they wire it up. Or, of course, you can wire it up too or see how they wire it up and so on. It’s up to you.
Couldn’t find something usable on Youtube
Good point! Some demo videos on this would be useful!