Splunk 8.0.2 Docker environment variable or defaul.yml setting for python.version = python3

Is there an environment variable or a setting for defaul.yml I can set for python.version = python3 so that it is added to the server.conf? docker run -dt --restart=always --name=splunk--hostname=splunk --privileged -p 8000:8000 -p 8001:8001 \ -v /home/user/mysplunkinstallation/default.yml:/tmp/defaults/default.yml \ -e SPLUNK_START_ARGS=--accept-license \ -e SPLUNK_PASSWORD=splunk\ splunk/splunk:8.0.2