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I would like to have a port on my computer that forwards to a port on another computer. But I can't connect directly to the other computer. Instead, I have to go via a jump host. 

   my computer                               jump                  another computer
@@@@@@@@@@@@@@@@@@                    @@@@@@@@@@@@@@@@@@          @@@@@@@@@@@@@@@@@@
@                @                    @       (D)      @          @       (C)      @
@                @         ssh        @                @          @                @
@ my app -----> 1234 <==============> @      auth      @ -----> 8080 ---> database @
@                @ (A)   username     @                @      (B) @                @
@   ssh client   @         (E)        @   ssh server   @          @                @
@@@@@@@@@@@@@@@@@@                    @@@@@@@@@@@@@@@@@@          @@@@@@@@@@@@@@@@@@

Example

My application on my computer is configured to connect to a database on localhost:1234.
This should connect it to the database on another-computer:8080.