Sorry, but I mixed up apps. I have Yarr directly set up as a systemd service:

[Unit] Description=Yarr Service After=network.target

[Service] ExecStart=/home/darkl1nk/yarr/yarr -auth-file=/home/darkl1nk/yarr/auth.file WorkingDirectory=/home/dark

I downloaded the precompiled package (github.com/nkanaev/yarr/…/yarr-v2.4-linux64.zip) and placed it at my home directory. Then a created a site for nginx to map my subdomain to the local port 7070.