Are multiple LDAP userbases possible?

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This is pretty straightforward:

authc: #authentication with multiple ldaps
  auth_first_ldap:
    http_enabled: true
    transport_enabled: true
    order: 1
    http_authenticator:
      type: basic
      challenge: false
    authentication_backend:
      type: ldap
      config:
        ...
        bind_dn: binddn1
        ...
  auth_second_ldap:
    http_enabled: true
    transport_enabled: true
    order: 2
    http_authenticator:
      type: basic
      challenge: false
    authentication_backend:
      type: ldap
      config:
        ...
        bind_dn: binddn2
        ... 
authz: #authorization with multiple ldaps
  roles_from_first_ldap:
    http_enabled: true
    transport_enabled: true
    authorization_backend:
      type: ldap 
      config:
        .....
        bind_dn: binddn1
        .....
  roles_from_second_ldap:
    http_enabled: true
    transport_enabled: true
    authorization_backend:
      type: ldap 
      config:
        .....
        bind_dn: binddn2
        .....
  roles_from_third_ldap:
    http_enabled: true
    transport_enabled: true
    authorization_backend:
      type: ldap 
      config:
        .....
        bind_dn: binddn3
        .....
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