Jump normal. The more you overthink it, the more likely it’ll get worse. Use natural mechanics and let strength training’s effects (quad/glute mass especially, strength, power) & jump frequency help make your natural mechanics more efficient. It’s very hard to focus on form with jumping, sprinting, and running, especially if you don’t have a skilled coach. Most people who learn things online and try to change their form in these dynamic movements, actually do more harm than good. The biggest example of it I can think of, is the “midfoot/forefoot” running crowd.
As for what type of squats you should be doing in the gym: for athletic performance training that involves jumping & sprinting, a shoulders width stance and narrower (to feet nearly together) are very important. Athletes who learn to lift on the internet don’t normally take advantage of narrow stance squatting because of the depth taboo - it’s harder to go deep as the stance becomes more narrow. As with any squat, depth should be constrained by safety and form. Tension should remain in the musculature - not the joints or tendons. It’s worth experimenting with these stance widths, just start light & stay relaxed/controlled.
my 2 cents.