How to create custom fields?

Hi.
We want to create custom fields like: PatientPhoneNumber, PatientIDIsIncorrect, StudyConclusion etc. Is it possible through Orthanc REST API, without modifying Orthanc code?

Thanks!

Locking this thread, as it is a duplicate of another one that has already received an answer from Alain:
https://groups.google.com/g/orthanc-users/c/2JoIXezQHT4/m/utJ-Z2hAAAAJ