jobs.html on index for a subdomain would probably need like proxying / /jobs 200 some rule like that (this is true for us and Netlify, not sure if Vercel can do this)_redirects file, this feels super limiting.

_middleware.js file that only matches on specific paths (e.g. mysite.com/blog/*, meaning /functions/blog/_middleware.js) that handles all of the blog specific redirects (etc).

jobs.html/ /jobs 200_middleware.jsmysite.com/blog/*/functions/blog/_middleware.js