ChatGPT's response to my question:
```
In Splunk, it is not possible to re-assign the ownership of a calculated field via the WebUI. This is because calculated fields are owned by the user who creates them, and the ownership cannot be transferred to another user.
The reason for this is that calculated fields are considered a type of saved search, and saved searches are owned by the user who creates them. Saved searches are a fundamental component of Splunk, and they play a vital role in many different aspects of the product. As a result, the ownership of saved searches is tightly controlled to ensure that users have full control over their own searches and are not able to access or modify the searches of other users.
If you want to transfer ownership of a calculated field to another user, you will need to delete the calculated field and have the other user create a new calculated field with the same definition. Alternatively, you could share the calculated field with the other user, which would allow them to use it in their own searches and dashboards, but not to modify or delete it.
```
