Zephyr Squad 8.0.2.80209622 import Test Cycles from Zephyr for Jira 5.4.1.54108287

Hi!

We recently migrated our Jira Server 8.5.2 Instance into a Jira DC 8.20.11 DC Instance.
During the Migration (usinf Configuration Manager), only the Test Cases without the Test Cycles were import in the DC Instance.
So I am looking for a way to import the Test Cycles also.

Test Cycles can be exported via the Jira GUI manually in the Server Instance but I didn't find a Way to import them into the DC Instance.
How can this be done ?

I also would like to do this whole Process via a Script using ZAPI or the likes.

I found https://getzephyr.docs.apiary.io/ but I don't see how to export/import Test Cycles via ZAPI API.

Any hints on how to accomplish this, would be greatly appreciated!

Thanks in advance,
Hans