I'll push back on this a little bit. The point of high school has never been job training, and I don't think it should be. The point of requiring education through high school is to develop kids as educated citizens of a society, not as workers. That's why the core subjects have always been some variety of math, science, English/literature, and history/civics. I have zero problem if high schools want to work in more job-focused options as electives for students. And they've always done that to an extent - shop class, home ec, etc. I think it would be fine to have a couple more classes in that regard, assuming you can find qualified instructors for them. But I don't think it's a good idea to add job training to the regular high school curriculum. Honestly if there's anything that you should consider adding to the basic high school curriculum, I would suggest basic financial literacy courses over anything job-related.
IMO the place where this sort of training is happening, and should be better advertised and utilized, is community college. I think many people think of community college generally as remedial college for people who couldn't get into a "real" college and that's not really accurate. Yes, they do (and should) have programs in more traditionally academic disciplines for kids who don't have the financial resources or grades to start at a 4-year college. But many of them offer tons of vocational training programs that result in both degrees and certificates, and often partner with employers to train for their specific needs. HVAC repair, electrical certifications, truck driving, operation and repair of advanced commercial machinery, commercial cooking, etc - these are just some of the things that most community colleges offer. These programs are generally very affordable, and through incentives could be made even more so. The trick is just erasing the stigma around "community college" that exists for many at the high school level and getting guidance counselors to advocate for it as an option. And of course, ensuring that state and local funding is significant enough to attract qualified instructors, build quality programs, and make it affordable enough for almost anyone to do.