It depends on the field.
eazybi can import changes for some default fields (Status, assignee, priority, issue type) but not for all fields. You can also define the change history import for other Jira custom fields, but they must be defined with data_type = “string” and they should be single-select fields (only one value per issue).
Then you could use a Javascript to find the author who did the change and return it.
But it won’t be possible to import changes for labels.
Please find Javascript examples to understand the concept on how to use a scripted fields to retrieve the changes from the imported issue changelog.
https://docs.eazybi.com/eazybijira/data-import/custom-fields/javascript-calculated-custom-fields
Martins / eazyBI team