The fund advisor, administrator and promoter may not have been exposed through Eikon Excel and Eikon Data APIs. I cannot find the fields to retrieve these data items.
The best way to verify if this data can be retrieved into Excel is by opening a ticket with Refinitiv Helpdesk, which you can do by either calling the Helpdesk number in your country or by using Contact Us capability in your Eikon application. If the Helpdesk provides you the field name to use in =TR function in Excel, then you can use the same field with Eikon Data APIs.