In addition to sibling commenter, niri exposes everything over an IPC accessible via its cli (or a socket), so if you wanted, say, a keybind to switch to your terminal, no matter where it is, you could bind it to this:

  niri msg action focus-window --id $(niri msg --json windows | jq '.[] | select(.app_id=="foot") | .id')

Nice! I have a jq/ipc based abomination of a run-or-raise equivalent that works spectacularly well, including cycling windows in order. I keep saying I'll stick it in a repo.