Adjust Scene color tint

Is there a way I can adjust the Scene color tint in a post process volume using a umg slider. I’m not sure how I can reference this particular parameter.

If you can get a reference to your camera, you can do GetPostProcessSettings. Then Break that and you can select any of the bazillion attributes you might want to change. I think in your case it would be Color grading Misc > Scene color tint and then check on (As pin).