Deep link with firebase deep link?

I’ve like to create a shareable link that will open your app to a specific screen.
1: When the usr opens the specific link than open the app opens.
2: if the app is not install, this will redirect to AppStore or PlayStore
3: How do I receive the parameters of the url (app://relativePath?key=value) → it’s ok?

If it is not possible with firebase, can it be done in another way?

I saw this topic

External links to load a page from an AppGyver app (aka deep linking)

but there are certain things like URL Scheme in Build service that I don’t know :frowning:
I new with appgyver although I’m programmer :slight_smile: