You can do it using a title overlay with 2 shapes. One with low opacity covering the whole screen and a small green shape placed where the highlight should be.
Apply Chroma Key to the title. When applying Chroma Key to a Title, it hides any elements in the title having the color being keyed out, however it will also hide any element, or part of an element behind the element being keyed out.
I hope this helps.
D22C5DB4-B075-484A-AEDB-45E0516A648A.jpeg [ 579.99 KiB | Viewed 144 times ]
2482EB85-8A1D-4FFA-A451-A1EBEB3EBED0.jpeg [ 602.5 KiB | Viewed 144 times ]
2CCF7326-A4CA-44C9-B391-0F15C7131EC2.jpeg [ 464.33 KiB | Viewed 144 times ]