Hello and welcome!
You’d get channel or mix names to show up on the SD buttons using variables.
I would recommend having a look at my tutorial videos to see a good example. In the first video, starting at about 1:45, I add the mix name to the button.
https://discourse.checkcheckonetwo.com/t/v3-rcp-videos
The bottom video shows the meters in action, but doesn’t go into a lot about how to do it. Basically, though, you’d create a feedback for a meter, beit input, mix, matrix, whatever, and check “auto-create” so it makes the variable to store the meter value.
Then, add a “VUMeter” feedback, using this newly-created variable as the value.
Start with watching the videos and write back if you’re still getting stuck. Thank you for trying it out!