With these patches you should be able to define variable as following and get the aimed result:
nova_vendor_data_overrides: cloud-init: "#cloud-config\nubuntu_pro:\n token: <REDACTED>"
With these patches you should be able to define variable as following and get the aimed result:
nova_vendor_ data_overrides: config\ nubuntu_ pro:\n token: <REDACTED>"
cloud-init: "#cloud-