@majed samyal thanks for letting us know your thoughts. This should be possible using the same process from the docs here : https://learn.microsoft.com/en-us/azure/active-directory/reports-monitoring/tutorial-azure-monitor-stream-logs-to-event-hub
This will be the same process because the logs from B2C also show up in the audit logs. Per the docs here : https://learn.microsoft.com/en-us/azure/active-directory-b2c/view-audit-logs?tabs=applications
You can use a filter to get the b2c logged in events accordingly, or you can filter from the event hub.
If you have any questions/concerns/confusion around this please submit your feedback against the feedback forums here : https://feedback.azure.com/forums/169401-azure-active-directory
Also, please remember to mark this response as answer if this answers your question.