How to add a random value of timestamp into the header

Hello to everyone.

I’m pretty new in the using the gatling and now i’m confused with a question if it possible to add the random value of the timestamp into the header of the request?

For an instance in this way:

val headers_01 = Map(
“Client-operation-id” → “timestamp” ) // the “timestamp” is random and new for each user

Thank you in advance