[keycloak-user] How to set Identity Provider by Client

Hi there, maybe I am just blind, but reading the docs I see that identity providers are set on a per-realm-base. So now I'm asking myself if it is possible to use per-client-based identity providers, and if yes, how to do so. Eg. with the js adapter, Client A is being redirected to keycloaks login, and is allowed to use Google and Facebook as identity provider. But Client B only shows Twitter and/or Stackoverflow. Haven't found something about this and hope someone here could help me out! Thanks in advance, Dominik