Hi, I can offer you a solution using a function node easily enough but I suspect when you come to use this in a real world situation you wont be injecting values & the solution might not be that useful.
The issue is messages never travel at the same time so you either have to store the "person" for later modification or use a join node. For demonstration purposes I'll store the "person" in flow context.
Any how, I suspect you are more interested in the function code - essentially you can loop through the keys and assign the value from your payload to the other object.
Object.keys(msg.payload).forEach(e => {
msg.person[e] = msg.payload[e];
})
msg.payload = msg.person;
return msg;
alternatively you can use Object.assign
msg.payload = Object.assign({}, msg.person, msg.payload);
Here is a demo...
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