Cloud to Cloud Migration - Maintaining Timestamps

Hi All,
The Cloud to Cloud Migration tool works very well. As part of the migration I noticed that the timestamps for issues, comments etc… are maintained, which is great.

Is there a way to do the same via API’s Example:
Step-1 I GET “a” Issue from - Lets call it MIGR-1
I get all the timestamps etc… associated with the issue

Now could I take the data and do POST to another site and maintain the timestamps etc…?
Step-2 | POST issue retrieved MIGR-1 to to project MIGR

Project MIGR in has the same configuration as the project in

With the current api - POST /rest/api/3/issue timestamps are not maintained, so how is this being done in the backend? i.e. is this being done via some private API’s?