wildfly-datasources-galleon-pack | WildFly Feature Pack for DataSources | DB Client library

I'm working on a POC for a Galleon feature-pack providing the Camunda BPM subsystem.

My current progress can be found here: https://github.com/marcus-nl/camunda-galleon-pack

This article and the linked example/template have been very helpful thus far, but unfortunately I'm stuck at a point which these don't quite cover: customizing the standalone.xml configuration.

The required additions to standalone.xml are as follows: standalone.xml. So basically there are 4 additions:

1. The Camunda BPM extension and subsystem. This was no problem.
2. The H2 driver and Camunda datasource. The wildfly-datasources-galleon-pack was very helpful for this.
3. A job-executor configuration.
4. A process-engine configuration.

I can not figure out how to achieve 3 and 4. Starting with 3, the CLI command to simply add the job-executor (without a nested job-acquisitions element) is as follows: