Orthanc viewers

Hello, I wanted to know if there is the possibility of adding viewers in terminals without having to add them in the configuration of the orthanc server. If there is such a possibility, could you tell me how it is done? Thanks

As explained in the Orthanc Book, you can dynamically add modalities using the REST API of Orthanc (which can be done from command line), by PUT-ting on “/modalities” URI:
https://book.orthanc-server.com/users/rest.html#id2