Setting up a Facebook Public datastream will allow you to fetch publicly available data on either page or post level. Please note that you will still need a connection to set up this datastream, however, the connection will not determine which profiles you can access.
Since the amount of possible pages to retrieve is so large, you will get the following result in the drop-down:
Start typing the full name of the public page you are trying to access, to start the search and select the field from the drop-down.
Select the relevant metrics from either the Post or Page section of the settings.