Given the following item hierarchy:

• Jenkins root
  • ModifiableFolder (such as com.cloudbees.hudson.plugins.folder.Folder)
    • ComputedFolder (such as org.jenkinsci.plugins.workflow.multibranch.WorkflowMultiBranchProject)
      • JobDslAwareJob (such as org.jenkinsci.plugins.workflow.job.WorkflowJob with Jenkinsfile making use of the jobDsl pipeline DSL)

Without prior knowledge of ModifiableFolder, it is not possible to create a job under that folder:

• with JENKINS_ROOT lookup strategy
• with SEED_JOB lookup strategy as it will attempt to create under ComputedFolder which does not implement ModifiableTopLevelItemGroup

A "closest modifiable ancestor" strategy would help creating jobs within ModifiableFolder regardless of its characteristics (name, subfolder, etc.)