Watch App to Prevent IPhone Loss

In the past month I have nearly lost my iPhone X twice after leaving it on a desk or counter and walking away. It occurred to me that there might be an app that would alert you on your Apple Watch when you have wandered away from the phone. Perhaps as soon as the watch loses the Bluetooth signal.

I did a search and only found some articles about an app called Lookout which is supposed to have this feature. I downloaded it but it does not do what I want and the Apple Store ratings are poor. Does anyone know if such an ap exists?