Event grid Broker Bridge with HiveMq Broker or 3rd party Broker

We are trying to create UNS , with HiveMq and Event Grid , the all possible configuration is available in hiveMq documentation but not getting any supportive documentation on event grid broker connection & configuration.

hiveMq broker is hosted on Azure VM.

Questions.

1. Is Event Grid support direct broker to broker connection with hiveMq or other 3rd party brokers to form UNS.
2. If yes : What is the best suitable architecture to bridge between Event grid and HiveMQ.
3. If yes : How to Configure Event grid broker with HiveMq broker or 3rd Party broker without using any other services of Azure.