Sounds like a classic use-case for a sprinkle of API magic.
You can choose the tool you feel most comfortable with: Python, Ansible, Terraform, or Cisco Workflows (low code/no code automation built into the Dashboard).
You will want to start by listing the networks in the organization, then you’ll want to iterate through the list (“for loop” if it’s Python) and make an API call to get the MQTT settings for each network ID).
ChatGPT/copilot can help - they might make mistakes in the process.