No you can't. Well if you work for a small company, or don't have a job you can. However anyone working for a company with any size has to come up with the $1000+ per month their employer throws into the company insurance plan that they don't get by going with ACA. So sure you can, but it is so move few can afford so we may as well say you cannot.

Unless the employer offers you the $1000+ per month to opt out and get your own insurance, which quite a few do. Or, as more companies have been doing, just subsidizing your choice of plan through the marketplace so they don't have to think about it.