You don’t have to have some crazy special skillset or seniority. You just have to politely say no to any prospective employer who won’t offer it and keep searching.
Yes, of course negotiating power is limited if you’re in dire straits & must take any job. Definitely sucks and I wish we offered better protection to candidates in that situation.
But many people just don’t even think to ask, even when they already have a job they are OK to stick with if they need to turn down a different offer.