I was checking the feature list and saw ExperienceBundle was added - https://developer.salesforce.com/docs/atlas.en-us.sfdx_dev.meta/sfdx_dev/sfdx_dev_scratch_orgs_def_file_config_values.htm

However, when I try adding it to my scratch org definition file it gives me an error:

ERROR running force:org:create:  EXPERIENCEBUNDLE is not a valid Features value.

Is this not yet supported and wrongly documented?