Disconnect user from replica

Hello,

I have a PostgreSQL cluster on a read replication topology and I want to know if it's possible to send commands to all replicas from the primary instance (in this particular case, it'd be to disconnect one user from all replicas).
I know it is possible to log into each and every replica and issue pg_terminate_backend, but this solution isn't feasible in our case...
Any idea would help a lot! Regards

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Igor Fernandes Miranda Desenvolvedor | Tel.: (61) 992492816