We don’t have script access per se for this, but you can use the function that the vrsceneManager window calls to create the object:
vrayVRaySceneCreateNode(string $filePath, int $flipAxis);
where $filePath is a string that needs file_path/filename.extension and $flitAxis is an integer value with a 0-2 range (0 means don’t flip, 1 means flip, 2 means “auto” - i.e. let vray try to guess).
Here’s an example: vrayVRaySceneCreateNode("C:/Users/yolov/Desktop/cube.vrscene", 0)
And a few notes:
1. the filepath needs to be in quotes
2. the file path needs to use forward slashes