How can I append text and an output to a button?

Question

I have a program that I'm writing to scan barcodes.

Right now, I can get the output from the reader to show up in the button. This is what the code looks like:

decodeCallback = DecodeCallback {
            runOnUiThread {
                binding.button.text= it.text
            }
        }

What I want it to say though is this:

"Search For:

foo"

All inside the button.

I am really new to kotlin so I'm struggling with this one.