Provided that the databases you are looking to utilize as sources exist on the web, you should be able to specify them as specific web sources using Web Controls in the Advanced Source Controls of the chat. There is more info on this here:

If there are other aspects of this use case that aren't covered by Advanced Source Controls, would you mind reaching out to us at support@you.com with more details on this so we can look into this feature request further? Thanks for your patience.