OpenSSH Windows 10 Dynamic port forwarding: Desktop -> gateway -> target_server

I connect today from my Windows 10 desktop to a gateway (Linux jumphost) and from there to 10+ Linux target_servers in 2 different ways:

1. In CMD
   ...............A) ssh ab028583@gateway/jumpserver
   ...............B) from jumpserver ssh ab028583@target_server
   ...............C) I am prompted twice for password.
   ...............D) This works fine but it is cumbersome and not practical.

2. With a Putty session including
   ...............A) Host Name="jumpserver" IP
   ...............B) "Remote Command"=ssh -L8081:localhost:8080 ab028583@target_server
   ...............C) Tunnels="L8081 localhost:8081"
   ...............D) This also works fine but it is cumbersome and not practical.

Method 2) opens a tunnel and "localhost:8081" in a browser connects to target_server
Both methods above work very well but are non practical and time out quickly.
I don't create any SSH-keys at least that I know.

I need to implement an openSSH script to connect to each of the Linux target servers, including the userid and pwd in the script so I dont have to type it for each login.

Also I would like to include flags so the connection does not time out:

-o ServerAliveInterval=10 -o ServerAliveCountMax=15

Can anyone help me on how such a script looks like?

No repository file, test, or entry point is identified; start by reviewing the issue's Windows OpenSSH, gateway, dynamic forwarding, and keepalive requirements. Done would be documented guidance or a supported script approach that addresses login credentials, target-server access, port forwarding, and timeout settings.