Autoconnect to host

After 2 hours of messing around with this I simply give up.

VNC-Viewer-6.22.315-Linux-x64 client

I would like to automate the whole login, something like:

./VNC-Viewer-6.22.315-Linux-x64 host.lan

Without asking any username or password just logging in.

This works if I start the app standalone and double click on the host (credentials saved).

I have tried using the config file argument as well ~/.vnc/config.d/vncviewer so as many other options but it seems that there is no way to do this through the command line or is there?

Once again what I would like to accomplish here is to call the vncviewer without opening that dashboard, just connect to my host (no login details asked) and login.

Thanks