There is no direct integration between Facebook and Piano in regards to data import/export.
However, you would be able to create a daily user export programmatically via our API and then import this data into Facebook to create custom audiences.
The automated report would need to be configured on your end. Depending on the type of user data you want to send to Facebook (registered users, subscribers, users with granted access, etc.) you can use Webhooks to provide this data or our API. For example our User Export, Subscription list or User list endpoints.
Facebook's API for custom audiences is available here. We would recommend checking in with Facebook's dev support about the best way to import the data from Piano for your use case.