Thomas,
Sorry for the delay in answer. You are right; the creator of the issue currently is not imported into eazyBI. The solution with a custom dimension like with the channel field is not possible in eazyBI for Jira server because Issue data during import in eazyBI does not contain the “creator” field.
There is, however, the option to create the Jira Misc custom field and create a new issue property and dimension in eazyBI from the Jira Misc custom field. I currently do not have such an example of the Jira Misc script to post here.
It is possible to access the creator data in the eazyBI for Jira Cloud and create another custom Javascript for that with settings like this:
[jira.customfield_creator]
data_type = "string"
name = "Creator"
dimension = true
javascript_code = '''
issue.fields.customfield_creator=issue.fields.creator.name;
'''
Kindly,
Janis