It needs to be configured either as
a. A slave with one of the Arduinos a master. OR
b. A master that can talk to two slaves, thereby allowing through traffic from the second Arduino. I raise b. only because it might be simpler than making the phone a slave.
No, I don't dare ask what sort of phone it is and note that I only said "might". I don't know anything about the Nano 33 but, on reflection, your best solution may be to simply add another Bluetooth module to the first Arduino.