The Maven Project module handles creating Maven Jenkins projects. To create a Maven project, specify maven in the project-type attribute to the Job definition.
It also requires a maven section in the Job definition. All of the fields below are required, except root-pom, whose default is pom.xml, and maven-name which will default to being unset. Not setting maven-name appears to use the first maven install defined in the global jenkins config.
Example:
job:
name: doc_job
project-type: maven
maven:
root-module:
group-id: org.example.docs
artifact-id: example-guide
root-pom: doc/src/pom.xml
goals: "clean generate-sources"
maven-name: Maven3