@b0rk answered with that option as well. with alt+h in fish, it just opens as some kind of overlay, allowing me to search the man page without removing what I've entered first.
If the man page doesn't work, the second approach is `cheat <command>` with cheat being a fish function which queries cheat.sh/<command> and pipes the output into bat.
And only after that, I'll search for information via the browser ^^