Two possibilities for you:
Option 1: have a flow on each Pi sending the data you want to the 'control pi' and you could display it.
Option 2: I've got a project I've been playing with that installed a python program on each pi. Then a master pi can send out an mqtt msg that each pi (with the python program) will receive, turn the command and publish an mqtt msg with the reply. Here is an example of the output
If you click on the IP address it will attempt to open NR on that device.
This is a work in progress that I'm tinkering on but I'm pretty happy with it. If you are interested you can take a look at the GitHub page for it and install it. (note: I do have two outstanding items to document and fix. the first is if the name of the user on the Pi is not 'pi' and the second is installing a cron entry to restart the service each night.