[keycloak-user] SAML Binding - ECP Profile

Hi, I am trying to work on SAML ECP profile. According to Keycloak's server administration documentation this SAML binding is supported. But when I configure IdP/SSO in metadata I am not seeing any description/meta specific to ECP binding. Any documentation available on how to use ECP profile in Keycloak? Also, while testing IdP initiated SSO/ SP initiated SSO,how can I inform Keycloak to use specific binding? Is there any query string parameter available that I can use? Thanks!