support for grpc and how to generate uniques value for each request

[anup1384]

I am using gRPC curl to make POST requests, and within each request, I require the transaction_id to be unique. To generate load, I want to do this using Vegeta, ensuring that each request made with it will have a unique transaction_id.
If this feature is available, then please suggest me how can I do this.
grpc curl

grpcurl  -plaintext -d '{
  "transaction_id": "'12345'",     #this should be uniques in each request
}' 127.0.0.1:9090 com.abc.com/order