So back in March we got the Witcher 3, Cyberpunk and Witcher 2 from GOG availalbe through GeForce Now. Any chance of getting other games particularly new high requirement games on the GeForce Now platform?

Isn't that a publisher/dev decision? You'll note all the games you listed are CDPR games.

THIS.

This would be a publisher/developer decision.

If you need additional or other versions of a certain game added to GeForce Now, contact your dev's/pub's involved w/ specific said game & version. I did that recently for Ghost Runner, since Steam-version's on there on GFN - yet the Epic version is not.