Are there any possibilities for impoting all the friendlist from the integratet clients, like steam oder battle.net

You're able to import Epic Games, Origin, Steam, Uplay, Xbox and PlayStation currently.

If those users have a GOG account it will pop up as a recommendation for you.

As of right now that's the best the app can do, which to me isn't too bad.

yes, i know. all my games are already imported, but however i want to import even my steams friendlist and just not the gamelist

Showing Steam friends should be high on their priorities, because if this universal friends list feature is to be a thing at all, it needs to have Steam friends showing up there. I can understand PSN friends not being there right out of the gate, but Steam should be probably the FIRST one.