JSON : Having a random value for JSON attribut


My question is very focus on JSON and i don’t know if it’s possible.
I have a JSON with several attributes.
I would like to have one random attribute on this JSON. Is it possible with RobotFramework?

Here a piece of code :

“vente”: {
“dateMaj”: “2020-07-20T06:30:20Z”,
“reference”: “Random_value” }

I have several different JSON with this structure
For information, the “reference” attribute is unique.
The goal of this "randomisation"is to execute many times the test without to change manually the “reference” attribute.

Thanks !