Confused about arguments: socks5 upstream

[Dima Tisnek]

I'm trying to set up smth like this:

sequenceDiagram
    participant LoadBalancer
    participant goproxy
    Note over goproxy: 0.0.0.0:8080
    participant tailscale
    Note over tailscale: 127.0.0.1:1055
    participant remote
    Note over remote: 127.0.0.1:8080
    Note over tailscale, remote: tailscale VPN

    LoadBalancer ->> goproxy: HTTP
    goproxy ->> tailscale: SOCS5+HTTP
    tailscale ->> remote: Wireguard+HTTP

It seems I can't quite figure out the right set of arguments for goproxy.

Is this a supported configuration?
Can someone help me with command line arguments? 🙏🏻

P.S. I'm fine with either forwarding TCP "tunneling" (without unpacking app-level protocol), or HTTP "proxying" (unpack+repack). Both remote and load balancer are mine, I can configure those.