[keycloak-user] Server Initialization: Is there a REST API to create the first/initial admin user

Can the first admin user be created through a REST API? The doc https://www.keycloak.org/docs/4.3/server_admin/index.html#server-initiali... mentions that first admin can be created either by : http://localhost:8080/auth URL or with add-user-keycloak script. Is adding first admin possible through a REST API?