Perhaps there's some proxy out there that would do it. The closest you'll come to it at the moment is either privoxy (proxy with it's own rules) or alternativel

Perhaps there's some proxy out there that would do it. The closest you'll come to it at the moment is either privoxy (proxy with it's own rules) or alternatively, AdGuard Home, which is like pi-hole, but it also understands AdBlock Filters (though to be clear, it still only does host blocking).