Use the Frame rate as a Variable in Blueprints

I want to use the FPS counter in my game as an optimisation debugging tool while I work on it.
However, using the Delta World Seconds method does not work properly, as it doesn’t sync up to the actual FPS of the game. At times, it feels like its a fixed delta world seconds, since both start at exactly 90 fps when the game starts. But when the actual FPS drops to under 30, the BP version says at around 90 FPS.

Is there a way to actually get the FPS stat, as in: the actual one that displays on your screen when it is enabled from the viewport menu?