Resolution
It is possible to display Japanese characters in the description. However there is a problem during Form Submission and you cannot use the UI. To update the job description, you need to use the CLI/REST API to update the job.
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Example using the Jenkins CLI:
java -jar jenkins-cli.jar -s https://localhost:8080/ update-job my-job < my-config.xml
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Example using the REST API:
curl -v -X POST \ --data-binary @my-config.xml \ -u "user:$token" \ -H 'Content-Type: application/xml' \ "https://jenkins:port/job/my-job/config.xml"