Capturing Logstash version as a field?

[londonx]

I notice on startup the Logstash version is reported, however I don't see this logged in a field like you see with Elastic beats. Is this some sort of environment variable that I can capture into a field instead?

Logstash startup outout:
[INFO ][logstash.runner ] Starting Logstash {"logstash.version"=>"6.4.2"}