exactly for your case we do not have a document, but in general you can handle UART data like any other data from pheripherials. For that I would recommend to take a look into the 'Device Integration' example. Within this example you can see the basic concept how to forward data to an Embedded Wizard UI.
The first step would be to implement the routine to make the UART data from another board accessible via variable.
Then you can forward these data like in the 'Device Integration'.