Mouse follow feature is part of Animation addon and it can be applied to any object. In this example, I created Container with static width and height and added half transparent radial gradient in Background options. You can also experiment with mix blend feature.
Now, you just need to place this container inside Animation container and enable mouse follow option. By default, it will be applied to whole window. If you want to limit it only by specific block, you need to add additional steps
Place class to block where you want to limit. Now, put the same class inside Animation trigger. Don’t forget to add dot before class name (you can use also any css selector)
If you want to clip spot by container, also put Overflow hidden in Spacing panel of bound container and enable clip by object in Animation container. You can set also custom z-index if you want to put this spotlight above content blocks (your content blocks must have bigger z-index).
Also, don’t forget to set position relative in bound container and put your mouse followed container as direct child of bound container