As with all games, it's possible but don't hold your breath. There are many, many games that people would like to see here and while the GOG people are no doubt doing their best, some games are more difficult to obtain than others.
That said, the games were created by Sierra, which I think was bought by Activision. GOG has some kind of agreement with Activision, but this doesn't automatically mean Shivers will appear here any time soon. There might still be legal difficulties, i.e. it might be unclear who actually owns the rights to whichever game, amongst other potential obstacles.
Also, there's an official
wishlist. It's (arguably) pretty redundant these days, but go ahead and vote for your favourites.