How to let user defined in a container to access dbus systembus

Hi
I have dbus policy for a service running on the host for root user.
<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd"><busconfig>
  <!-- Only root can own the bus -->
  <policy user="root">    <allow own_prefix="org.myOrg.HostService"/>  </policy>
  <!-- Allow user "root" to invoke methods on the bus -->  <policy user="root">    <allow send_destination="org.myOrg.HostService"/>    <allow receive_sender="org.myOrg.HostService"/>  </policy>
</busconfig>

I have a process running in another container need to use this service.
This process run as a different user by name frr. This user is created on and known to only this container.
root@sonic:~# docker exec -it myContainer bashroot@sonic:/# ps auxUSER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMANDfrr         79  0.0  0.1 1215272 20316 pts/0   Sl   Dec09   0:04 /usr/lib/frr/zefrr         96  0.0  0.0  48348  8392 pts/0    S    Dec09   0:00 /usr/lib/frr/st


When these processes trying to use dbus, they are not able to get the dbus conn
40        static DBus::Connection conn = DBus::Connection::SystemBus();



I tried adding user 'frr' to the policy but realized later that host would not know about this user ( after I continue to see the same problem ).
How can I let users created on containers to be able to access it through a policy. Can I do it policy on the host or is there any other way?
These processes have a limitation that they can not be run as root.
~~  Thanks, Srinadh