It’s an old post but, I leave a comment because I think There are still many people that search for this these days.
You can get view projection matrix using custom node and
ResolvedView.ViewToClip fuction.Return value is a matrix so, you should acces rows or elements with a array access expression. e.g.
ResolvedView.ViewToClip[0][0]
I think there are more matrix like that in engine code so, If I need I should search through engine code.