This is a very POC example of how to create a Protocol Buffer message in Python,
serialize it in JSON format, pass the JSON string to a Python extension written in Go 
(with a cgo preamble), deserialize the protocol message in Go, and display it.

I have never programmed in Go before in my life.  Nor do I have a problem with run on sentences.

Set this:
$ export GOPATH=~/go
$ export PATH=$PATH:~/go/bin

Run this:
$ protoc -I=. --go_out=. stencil.proto
$ protoc --proto_path=. --python_out=. stencil.proto

Build like so:
$ go build -buildmode=c-shared -o libagent.so

Run like so:
$ python pygo.py

You should see something along the lines of:

string_values:<key:"pid" value:"18290" > string_values:<key:"tid" value:"140283880634176" > string_values:<key:"timestamp" value:"2019-04-24 00:59:36.388046" > string_values:<key:"uuid" value:"c46e9c2a-1b47-499a-ba3b-920292c4bbbe" >

Note I am running in a python3 virtualenv on Linux.  YMMV.

You will need to install protobuf in your python environment, jsonpb support, 
and also Go support for Protocol Buffers:

https://developers.google.com/protocol-buffers/docs/gotutorial