LG has revealed that certain 2019 OLED TVs will gain G-SYNC compatibility via a firmware update. This will apply to 55- to 75-inch C9 and 55 or 65 inch E9 variants. The OEM asserts that this development will enhance immersion in gameplay using these devices.
https://www.notebookcheck.net/LG-announces-NVIDIA-G-SYNC-support-for-select-2019-OLED-TVs.434766.0.html