Wrote more about #riscv far relative jumps with a detailed working example as well as the (wip) syntax for doing so in SubV:

https://git.s-ol.nu/subv/blob/master/JUMPING.md

(~10min read + ~5min think)

cc @akkartik @ekaitz_zarraga (I'm tagging you a lot, please feel free to disregard and/or let me know if you've had enough of this and I'll stop ;)