Get Private Key of already existing Origin Certificates


A month ago I created an Origin Certificates in Cloudflare panel, copied the certificate PEM and private key PEM directly to my Gitlab Page settings.

Today I want to add new sub domains, I can still download the Certificate of the Origin Certificates but not the private key.
There is no way to get the key from the Cloudflare panel? I have to re-create a certificate and keep the key this time?