How to link Metrika and AppMetrica? Or is there an alternative solution?

Question

Yandex.Metrica

The advertisers were given the task of linking Metrica data from the site and AppMetrica in a mobile application (android), which can be downloaded from the site.
The goal is to trace the path of the visitor, whether he eventually downloaded the application, whether he began to register, etc.

I didn't see anything in the documentation that this is even possible.
If the assumption "there is Yandex, here Yandex, one nonsense" :) turned out to be very erroneous, then the question is.
How then to solve the problem? What options are there? Taking into account the fact that viewing the site can be from a computer, and downloading is already on a smartphone ...

PS: in passing then it’s already interesting, but how is the situation in the case of Google analytics