big problem

ok… my situation is this… i’ve a television 4k HDR10 (NOT A MONITOR) with a gaming mode for no latency… but… them work only if i put a full screen or bordless… but… if i make them… the game lock my setting to low resolution at 2140*1218… listen… i’ve a asus rog 1070 OC not a 30** series on graphic card… and i need to play to 1080p… there is a possibility to set from “config file a custom resolution”??? i need it for solve a little problem… 45 fps with all to low… and if a game make full screen mode i give usually more up of 100fps… but wait… infinite not have for moment full screen… please… i really need to know how for set bordless but 1080p because from game him lock me to same at 1440p and my card going to die for them…