Only slighly off topic... Node-Red - how to build a text string that referenced a msg.payload

I'd really like to combine two values, but it seems like each topic is triggered separately.

It would be cleaner from the SMS reader's point of view for the message to be:

printf("Alert, the button was pressed. This is press %d since powered up.  Battery level is %d.",  msg1.payload,  msg2.payload)

but it isn't clear to me how to do this graphically in Node-Red.