I don't recall having to provide past salary and I don't think it is legally obligated: https://www.pbs.org/newshour/economy/ask-the-headhunter/ask-the-headhunter-never-ever
The past several jobs, the pay is done by a formula based on years of experience and shift and you fall somewhere in the formula and that is the salary. That has been in both unionized and non-unionized facilities.
I would wonder if you will be satisfied with a clinical nursing job? I had a previous profession many years ago, raised children for 25 years, then went back to school to get the RN and have been exclusively a clinical nurse in hospitals for the past 7 years. I can tell you that you will not be treated as a professional like you are in other professions. It is much more like a blue collar job. There are extremely strict policies and punishments surrounding sick time. One job I had you could not even use your sick time when you are sick (which I found very strange) You had to use PTO unless you were sick several days and got a doctor's note. And if you call in sick 4 times in a year, they can fire you- every time sick counts as an "incident" and if you call in on a weekend it counts as two "incidents".
I virtually never called in sick. Changed several jobs with weeks of sick time still on the books. Just the attitude of suspicion and stinginess around those benefits felt very disrespectful and unprofessional to me. As if they were ASSUMING I am cheating if I was ever to call in sick. My previous career as an engineer, we were not treated like that. The benefit was the benefit and you were entitled to it if you needed it.
If I was the hiring manager, the fact that you made 190K and were a respected professional would make me wonder if you could tolerate the relatively very humble pay and treatment of being a floor nurse. I would keep that a secret if you really want to get into the hospital. I don't include my first bachelor's and masters degree on my resume nor applications, nor do I include any references to my former engineering career.
Perhaps you should be looking into other nursing roles at hospitals- non clinical roles? Or you might make a great sales rep for a company - there are nurses that go around and present inservices on various new products the hospital buys. eg- skin care products, urine testing kits, iv start kits, telemetry monitoring units, etc etc etc....