yes, you can configure a tcp tunnel for a direct connection to a server from games, or use http tunnels to use a utility service server as a website without port forwarding
here is a quick guide I use when i forget, on how multiple tunnels can be opened on one account for free: - https://medium.com/@singhgautam7/ngrok-make-full-use-of-free-tier-version-to-expose-your-localhost-to-the-internet-1160e652d794
Alright, my bad didn't read through entirely, so you can use qbittorrent for this, and qbittorrent-nox on linux.
You enable the remote web access (called Web UI in settings for the gui version and enabled by default in qbit nox on linux) for qbittorrent and it runs on port 8080 by default. You can then use ngrok to make a http tunnel to localhost:8080 and you're good to go.