Scrabbler makes a good point.
A Subaru Outback is a car…IMO and I wouldn’t expect ANY car to run with chains. They have 17" low profile alloys ? Even if you could squeeze them in I’d hate to take a chance with the rims. If you anticipate ever using chains, get a truck/truck based SUV and steel rims…otherwise, you take the chance with the owners manual.
They have some new products out that are promising (tire socks etc). Keep an eye on them and reviews. Something may turn up in the next year or so that you could substitute for in a pinch only. But I wouldn’t hold my breath.