Most modern fighter and ground-attack aircraft have only one gun, so there is nothing to provide convergent aim for.

However, even with a “simple” ranging radar gunsight (which have been around since the early 1950s), the weapon computer does apply a range-based offset to account for both bullet drop and the distance between the radar and the gun barrel as well as (in the US fighters, at least) the off-axis angle the gun was aimed for (to prevent the aircraft from hitting its own bullets, as happened in early supersonic fighters).