This has come up a few times before.
The field at Cleveland Browns Stadium doesn't meet FIFA standards, so hosting a World Cup match seems like a pretty big reach.
FIFA standards are a minimum of 105 x 68 meters of playing space, with another 7.5m behind the goals and 6m along the sides.
So minimum space for the field is 119 x 83 meters.
Source for these numbers here.Cleveland Browns Stadium is 114 yards x 69 yards --- good enough for international friendlies and club matches, but would require a waiver or something to meet FIFA standards for the World Cup